Revert "THRIFT-5564: [CI] use GitHub workflow matrix to parallel cros…

[Jimexist]

…s tests (#2801)"

This reverts commit 790d4cb.

• Did you create an Apache Jira ticket? (Request account here, not required for trivial changes)
• If a ticket exists: Does your pull request title follow the pattern "THRIFT-NNNN: describe my issue"?
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[Jimexist]

sorry that the original pull request was merged / closed prematurely. will need to delete these 2 accidentally checked in files.