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Reject Maven md5 requests in FIPS mode

Steve Abrams requested to merge 361263-maven-api-fips into master

What does this MR do and why?

To be FIPS compliant, GitLab cannot make use of MD5 values. The Maven package registry uses MD5 files as a possible checksum.

This MR updates the Maven API to reject requests that:

  • Request files with the format .md5
  • Upload files with the format .md5
  • Upload files that include the file.md5 param.

These are rejected as 422 Unprocessable Entity.

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Related to #361263 (closed)

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