Promtil: Fix a panic when using the loki push api target. #5761
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What this PR does / why we need it:
We were passing in the active metrics registry to the util tool that sets up the logger to be used by the push server, this resulted in a duplicate metrics registration.
The metric being registered is not important so this PR just passes in an empty registry to use to init the logger.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Checklist
CHANGELOG.md
about the changes.