Convert BlobHeader to Vue: Add lock button

Issue: #323210 (closed)

MR	Changes
!60883 (merged)	Name (Copy File Path)
!60883 (merged)	File Size
TBD	Edit / Web IDE Link Buttons
This MR	Lock
TBD	Replace
TBD	Delete
!60883 (merged)	Viewer Switcher
!60883 (merged)	Copy content
!60883 (merged)	Open Raw link button
!60883 (merged)	Download link Button

What does this MR do?

This is part of a bigger effort to convert the entire BlobHeader from HAML to Vue. In this MR, we implement the Lock button.

Testing Case

This feature is behind a feature flag, to turn on:

rails c

Feature.enable(:refactor_blob_viewer)

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because _____.
• 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 #32321