Added commit type to tree GraphQL type

See merge request gitlab-org/gitlab-ce!29412

Adding new `AddAwardEmoji`, `RemoveAwardEmoji` and `ToggleAwardEmoji`
GraphQL mutations.

Adding new `#authorized_find_with_pre_checks!` and (unused, but for
completeness `#authorized_find_with_post_checks!`) authorization
methods. These allow us to perform an authorized find, and run our own
additional checks before or after the authorization runs.

https://gitlab.com/gitlab-org/gitlab-ce/issues/62826

This makes sure we also enforce authorizations for non-nullable
fields.

We are defining our authorizations on the unwrapped
types (Repository). But when a type like that is presented in a
non-nullable field, it's type is different (Repository!). The
non-nullable type would not have the authorization metadata.

This makes sure we check the metadata on the unwrapped type for
finding authorizations.

This also disables the cop with a reasoning in types where appropriate

Make task completion status available via GraphQL

Closes #62910

See merge request gitlab-org/gitlab-ce!29573

Add specs for task completion status (graphql)

Fix style issues

Changed format of constants in spec

Refactor specs to reduce creation of records

Reduce parameters to merge request creation

Use set's for project and user

Move let's out of it_behaves_like block

Fix description parameter

Fix format of lets

Use dig to get task completion status out of graphql response

Modified rspec output

Add changelog entry

Add the missing check on GraphQL API for project statistics

This exposes `Note`s on Issues & MergeRequests using a
`Types::Notes::NoteableType` in GraphQL.

Exposing notes on a new type can be done by implementing the
`NoteableType` interface on the type. The presented object should
be a `Noteable`.