Ensure that all in-built codecs and copiers have corresponding tests, fix issues found #8769
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As evidenced by #8766 (PR: #8768), not all codecs & copiers have tests currently.
Hence, this PR adds tests for the missing codecs & copiers, fixes the issues which doing so uncovered, and adds an additional test which checks that all built-in codecs & copiers have tests.
Microsoft Reviewers: Open in CodeFlow