Adjust Big Sur bot allocation to ensure that 12-core machines are used for layout tests, and those with fewer cores are allocated to API tests.
<rdar://problem/103880039>
Pull request: https://github.com/WebKit/WebKit/pull/8200
Committed 258440@main (e581d875e971): <https://commits.webkit.org/258440@main> Reviewed commits have been landed. Closing PR #8200 and removing active labels.