Do not use require in http handlers (testifylint)

Ash McKenzierequested to merge
ashmckenzie/fix-linter-errors into master

What does this MR do and why?

This test-only MR resolves the go-require: do not use require in http handlers (testifylint) linter error for a number of files.

Related issue: Resolve `go-require: do not use require in http... (gitlab-shell#769 - closed)

Edited by Igor Drozdov

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