[6.0] Prepare for introducing swift-foundation into the toolchain #74108
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Cherry pick of #74019
Explanation: Adds swift-foundation/swift-foundation-icu to the checkouts list and provides some extra flags to the Foundation build
Scope: Shouldn't impact anything in practice, but only has the ability to impact the Foundation build
Original PR: Pull Request link from main branch
Risk: Minimal - this change provides extra, unused flags to the Foundation build and checks out repos that are not yet used
Testing: PR testing via swift-ci
Reviewer: @etcwilde @bnbarham @iCharlesHu