Connect settings button to open board list settings sidebar

What does this MR do?

In EE this MR connects clicking the Board List Settings button in the board header to the newly created drawer component.

Repro Instructions:

• In rails c Feature.enable(:wip_limits)
• Go to Project and Group Issue Boards
• Click on the gear icon

Notes:

• We will need fix how we render the sidebar to account for the various header options in the admin panel. Broadcasting messages, perf bar etc. Currently the issuables list sidebar checks if the perfbar is showing up and will adjust the position from top. Another more flexible option is attaching the Sidebar to the content wrapper so it doesnt matter what header options we have.

Screenshots

wip_limits

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

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