Make string formatting consistent
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Problem
Within routes.go (https://gitlab.com/gitlab-org/gitlab-workhorse/-/blob/master/internal/upstream/routes.go) and upload_test.go we're inconsistently using double quotes and back ticks to delimit strings.
Proposal
Since back ticks and double quotes work differently in Go, but there doesn't appear to be inconsistently used for the same thing, I would propose identifying places where special characters are required and use double quotes there or, just standardise on double quotes.
Examples
https://gitlab.com/gitlab-org/gitlab-workhorse/-/blob/master/internal/upstream/routes.go#L249
https://gitlab.com/gitlab-org/gitlab-workhorse/-/blob/master/upload_test.go#L138
/cc @steveazz