Global Search - Left Sidebar

What does this MR do?

Closes #241691 (closed)

This change creates a search facet sidebar for the issues and merge requests view. This will be the location we use in the future to add more search facets.

This change moves the Status and Confidential filter over to the facets and converts them to Radio Buttons from the Dropdown they were before.

These filters also do not auto apply, and instead they require an apply button to be pressed. This allowed us to remove a lot of logic from the filters themselves.

Screenshots (strongly suggested)

Desktop View

	Issues	Merge Requests
Desktop View

Reset Filters

	No Filter	Filter
Reset Filters

Smaller Views

	Medium (Tablet)	Mobile
Smaller Views

Other Views (Unchanged)

	Before	After
Projects
Milestones
Comments
Code
Commit
Wiki
Users

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

Related to #241691 (closed)