Add new GitLab CI configuration facade class

## What does this MR do?

This MR is a first iteration of major CI configuration refactoring. See #17139 and #15060 for more details.

## What are the relevant issue numbers?

Closes #17139

See merge request !4462

This is a temporary refactoring stub, that is planned to be removed
after removing legacy config processor.

As for now, we keep this class inside a oryginal config processor class.
We will move implementation to this class and delegate to it from
current config processor.

After original gitlab ci yaml processor not longer has relevant
impelemntation we will replace it with new configuration class.

Favor `unless` over `if` for negative conditions
(or control flow ||).

See #17478

Enable multiple compatible Rubocop cops

## What does this MR do?

This MR enables multiple Rubocop cops, that are already compatible with
our codebase. See #17406.

Cops enabled:

```text
Style/ArrayJoin:
  Description: Use Array#join instead of Array#*.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#array-join
----------------
Style/Attr:
  Description: Checks for uses of Module#attr.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#attr
----------------
Style/BlockComments:
  Description: Do not use block comments.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-block-comments
----------------
Style/ClassMethods:
  Description: Use self when defining module/class methods.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#def-self-class-methods
----------------
Style/EndBlock:
  Description: Avoid the use of END blocks.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-END-blocks
----------------
Style/EvenOdd:
  Description: Favor the use of Fixnum#even? && Fixnum#odd?
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#predicate-methods
----------------
Style/FileName:
  Description: Use snake_case for source file names.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#snake-case-files
  ExpectMatchingDefinition: false
----------------
Style/FirstMethodParameterLineBreak:
  Description: Checks for a line break before the first parameter in a multi-line method
    parameter definition.
----------------
Style/FlipFlop:
  Description: Checks for flip flops
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-flip-flops
----------------
Style/GlobalVars:
  Description: Do not introduce global variables.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#instance-vars
  Reference: http://www.zenspider.com/Languages/Ruby/QuickRef.html
----------------
Style/IfWithSemicolon:
  Description: Do not use if x; .... Use the ternary operator instead.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-semicolon-ifs
----------------
Style/LambdaCall:
  Description: Use lambda.call(...) instead of lambda.(...).
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#proc-call
  EnforcedStyle: call
----------------
Style/MethodName:
  Description: Use the configured style when naming methods.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#snake-case-symbols-methods-vars
  EnforcedStyle: snake_case
----------------
Style/MultilineMethodDefinitionBraceLayout:
  Description: Checks that the closing brace in a method definition is symmetrical with
    respect to the opening brace and the method parameters.
----------------
Style/NestedModifier:
  Description: Avoid using nested modifiers.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-nested-modifiers
----------------
Style/OpMethod:
  Description: When defining binary operators, name the argument other.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#other-arg
----------------
Style/SignalException:
  Description: Checks for proper usage of fail and raise.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#prefer-raise-over-fail
  EnforcedStyle: only_raise
----------------
Style/SpaceAfterNot:
  Description: Tracks redundant space after the ! operator.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-space-bang
----------------
Style/SpaceBeforeSemicolon:
  Description: No spaces before semicolons.
----------------
Style/SpaceInsideRangeLiteral:
  Description: No spaces inside range literals.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#no-space-inside-range-literals
----------------
Style/SpaceInsideStringInterpolation:
  Description: Checks for padding/surrounding spaces inside string interpolation.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#string-interpolation
  EnforcedStyle: no_space
----------------
Style/StabbyLambdaParentheses:
  Description: Check for the usage of parentheses around stabby lambda arguments.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#stabby-lambda-with-args
  EnforcedStyle: require_parentheses
----------------
Style/StringMethods:
  Description: Checks if configured preferred methods are used over non-preferred.
  PreferredMethods:
    intern: to_sym
----------------
Style/VariableInterpolation:
  Description: Don't interpolate global, instance and class variables directly in strings.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#curlies-interpolate
----------------
Style/VariableName:
  Description: Use the configured style when naming variables.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#snake-case-symbols-methods-vars
  EnforcedStyle: snake_case
----------------
Style/WhenThen:
  Description: Use when x then ... for one-line cases.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#one-line-cases
----------------
Style/WhileUntilModifier:
  Description: Favor modifier while/until usage when you have a single-line body.
  StyleGuide: https://github.com/bbatsov/ruby-style-guide#while-as-a-modifier
  MaxLineLength: 80
```

Closes #17406 

See merge request !4286

Closes #17406