Update Audit Events navigation and visibility

What does this MR do?

This MR attempts to achieve two things:

• Relocate Audit Events submenu in Settings menu to be under Security & Compliance menu (for both Projects and Groups)
• Adjust permission to view Audit Events to Developer role and above

⚙ Implementation

• Rejig projects_helper, groups_helper and related haml to relocate Audit Events submenu
• Incoporate read_project_audit_events and read_group_audit_events permission to both controller and view
• Add more test coverage
• Fix all QA tests related to menu relocations

📷 Screenshots (strongly suggested)

Menu relocation

Name	Before	After
Project
Group

Search page appearance by roles

Name	Before	After
Project Audit Events	Maintainer and higher	Developer
Group Audit Events	Owner and higher	Maintainer and Developer

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required) (!49930 (merged))
• 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 #257514 (closed)