Toggling on/off locking of issues/mr

What does this MR do?

• Update the lock status of MRs and issues using graphql mutations
• Refreshing page is no longer required as toggling the lock button also toggles the Vuex state of the issuable note.

TODO

• !37043 (merged) should be merged before this MR.
• Settle on a new name for lock_issue_sidebar component. => will be done in a separate MR !38076 (merged).

Screenshots

Screen_Recording

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

Issue #19411 (closed)