rename Statuseable to HasStatus

## What does this MR do?

- Rename all instances of Statuseable in the codebase, to HasStatus
- Rename all files from statuseable to has_status

## What are the relevant issue numbers?

Closes #21103 

See merge request !6003

Make all future skipped builds as processable when retrying a build

## What does this MR do?

Makes a builds that are marked as skipped when a pipeline is processed to be reprocessed by changing their's state to created.

## Why was this MR needed?

Currently retry is broken. When you retry a build of pipeline it will succeed and be marked as succeeded, when the next stages should be triggered.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/21066

See merge request !5879

* upstream/pipeline-hooks-without-slack:
  Make explicit call for all event types for ProjectHook factory
  Capitalise URL on web_hooks/form
  Remove changes not related to this MR
  Added documentation for pipeline hooks
  Rename queue to enqueue in tests
  Instrument Project.visible_to_user
  Fix build play failure
  Update ruby 2.3.1
  Improve transition between states for event `enqueue`
  Use event `enqueue` instead of `queue`
  Fix test failures
  Fix bug where destroying a namespace would not always destroy projects
  Remove unused SpamReport model; this was renamed to SpamLog
  Corrected links/usernames in performance guide
  Add gravatars to build history
  Add deployment ID and gravatar to environments page
  Format environment history page
  Add avatar to commit message; environment style updates to match pipelines page
  Style deploy button

* pipeline-hooks-without-slack: (156 commits)
  Fix test failures
  Make pipeline to be in created state for hooks tests
  Make `execute_methods` public
  Added specs for started_at and finished_at
  Use explicit events to transition between states
  Fix tests. We cannot reload unless it's already saved:
  Have trait all_events_enabled so that's easier to reuse, feedback:
  Simplify the name for data builder, feedback:
  Prefer extend self over module_function, feedback:
  Make it more grammatically correct, feedback:
  if -> when; when -> `when`; %w() -> %w[]; and fix some typos:
  Prefer described_class, feedback:
  Make the comment more clear, feedback:
  Update CHANGELOG
  render only commit title
  Fix test failures, that did occur because of missing previously used `reload_status!` call
  Use state machine for pipeline event processing
  Upgrade Rails to 4.2.7.1 for security fixes.
  Update gitlab-shell to v3.3.3
  Verify the pipeline status after executing events on builds
  ...