fix(version-tools): Fix scheme detection and add more test cases #21710
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In #21641 I tried to fix version comparisons between semver and RC prereleasse builds. Unfortunately, the fix was flawed because the scheme detection was not run on the input version, but rather the "internal version" in the case of internal/RC builds. This caused patch releases to get identified as major releases in the RC pipelines, which in turn causes GH releases to be created incorrectly.
I corrected the code by running schema detection earlier in the function, and I added several test cases around RC versions to ensure the bug was addressed.