Reenable AttributedString index tracking swift testing tests #1338
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This reverts the revert performed in #1337 (which was done to recover the swift repo's CI which began failing on Linux due to the tests hanging) and disables
FOUNDATION_EXIT_TESTS
on Ubuntu 20.04. Exit tests currently hang indefinitely on 20.04 (swiftlang/swift-testing#1140) (which is what the swift repo's CI uses for full toolchain tests) while Ubuntu 22.04 (which is what this repo's CI uses) works fine.