#53245: build: improve non-Chromium CL version check in roll linting
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Description of Change
Looks like Chromium Dash now sets earliestVersion correct for non-Chromium CLs, so we don't need need the hack of checking the relations, which didn't always work reliably as there could be multiple relations (roll, cherry pick, etc).
Also cleaning up the output text to label non-Chromium CLs since the numbers are similar and it's not immediately obvious when a CL is not for Chromium.
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