Use new vuex store for code quality MR widget

What does this MR do?

We are moving the Code Quality MR widget to GitLab Core - see issue #212499 (closed)

This MR turns the <report-section> (in ee/) that was the code quality MR widget into its own vue app (outside of ee/). The widget will now have its own dedicated store, so this MR also removes the now-defunct code quality widget functionality from the EE MR widget store.

How does this MR fit into the solution for the issue?

Merge Request	What's it do?
!36114 (merged)	Backend changes to move everything needed to expose the paths to the downloadable codeclimate artifacts out of the ee directory
!36119 (merged)	Make a vuex store for the code quality mr widget to use (outside of the ee directory)
👉🏻 this MR	Replace the <report-section> that currently displays the widget (inside ee) with a vue app (outside ee) that uses the vuex store from !36119 (merged) and the paths from !36114 (merged)
!36121 (closed)	Update documentation (will get reviewed there and then cherry-picked into !36120 (merged))

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team