Enable secret detection in MR Widget

Related #244836 (closed)

What does this MR do?

This should enable secret detection reports in MR Widget by

• Adding secret_detection to enabled reports

• Setting correct help path, comparision path and

• Replacing secret_scanning with secret_detection wherever necessary for frontend to send correct request params

  (This is due to the fact that the frontend uses secret_scanning while backend expects this report category as secret_detection)

Follow ups

1. frontend - #247498 (closed), #247500 (closed)
2. backend - #247532 (closed)

Screenshots

What	Screenshot
When no vulnerabilities are found
With vulnerabily
Tooltip

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