Only check for blacklisted IPs on Git requests

What does this MR do?

We block IP addresses when failed Git auths reach a certain threshold.

This block applied to all requests so for every request, we had to check Redis to see if the IP is blocked. This caused unnecessary Redis load.

This MR changes the block to only apply to Git requests as it is described in the documentation

Screenshots

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

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

#35617 (closed)