Use 403 when PA licensed feature is not available

What does this MR do?

The frontend code expects the 403 HTTP response code (we currently return 404) to be returned in order display message about the missing license or missing user permission on the productivity analytics page.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Performance 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