feat: add ability to check/log whether FIPS crypto has been enabled

João Pereirarequested to merge
add-fips-check into master

Closes https://gitlab.com/gitlab-org/container-registry/-/issues/671.

This MR uses the new https://pkg.go.dev/gitlab.com/gitlab-org/labkit@v1.14.0/fips package to determine whether we're running in FIPS mode or not. If we do, a message is logged during startup to make that clear.

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