Make string formatting consistent
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=324877) </details> <!--IssueSummary end--> ### 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
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