Previously in FIPS mode when a Gradle build attempted to publish a
package with an MD5 checksum, GitLab Rails would return a 422 error.
This only showed up as a warning with Maven, but Gradle fails the
publish step entirely.

In FIPS mode, we've already told Workhorse not to generate a MD5
checksum via `UploadHashFunctions`, and the first FIPS check in the
PUT request ensures that Workhorse obeys that. However, there was a
second check in the PUT request that rejects the `.md5` suffix, but
this is unnecessary since no MD5 checksum will be
stored. `extract_format` is a shared helper, make this second FIPS
check optional since we still want to reject GET requests with the
`.md5` suffix.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/436387

Changelog: fixed