scm: mercurial: split latest_changesets tag test with limit or not (#14361)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012762
scm: mercurial: add latest_changesets "default" branch test (#14361)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012763