Document and remove unused code

Declare components in a consistent way;
Use " instead of ' to improve consistency;
Update documentation;
Fix commit author verification to match the use cases;

Adds tests for the added components

Fix paths in pagination spec

Adds tests to pipelines table used in merge requests and commits

Use same resource interceptor

Fix eslint error

Remove duplicate data-toggle attributes.

Reuse the same pipeline table

Remove unneeded required resources

Remove unused file; Fix mr pipelines loading

Updates documentation

Use ReactiveCaching to update external CI status asynchronously

See https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2055

Remove unused file

Fix commit link

Fix specs

when we care only about the number of commits

We do not have to instantiate all objects in this case.

MergeRequest#commits requires merge_request_diff to be present.
This is not the case when creating a new merge request.

Previously, they were only being loaded on the actual `show` action, but
not the actions representing the tabs (commits, builds, etc).

fix issues pointed out in !6527

add task completion status feature to CHANGELOG

Closes #23615