[6.0] Build and install swift-testing in toolchains (#75837)
* Add swift-testing to update-checkout
(cherry picked from commit 19910c6c227ff7e05bd344a85cb66fa1acc4b263)
* Build script changes to begin building and installing swift-testing into toolchains (on Darwin, so far)
(cherry picked from commit 97e85a6bf20b38e2ac754de81d1d87585cea2a95)
* Add swift-testing to Linux presets too
(cherry picked from commit ff5ece15bc5e7a0faa6d1a0abbe57f146f349142)
* Improve description of new build-script flags
(cherry picked from commit c8d7d134b01897d16d0b4617a65911c38aec3c5a)
* Fix header comment
(cherry picked from commit 155e4c857bbee230ea16b228e2f7d3612507d14e)
* [swift-testing] Build tweak
* Remove SwiftSyntax product dependency
* Correct CMAKE_BUILD_TYPE
(cherry picked from commit e06d38b3ac6b063fc116df9dfcb44b48eeefb5f3)
* [Windows] Build and install swift-testing in Windows toolchains
* Basically following XCTest scheme.
* Build TestingMacro separately from Testing library and install it to
the toolchain's `bin`
* Testing swift-testing itself is TODO
(cherry picked from commit f069aecca504ce98abf85faf80d4919ca59af1cc)
* [build-preset] Add swift-testing to incrmental bots
(cherry picked from commit 6a383293c4a916b3e77924cf1c45fecf771c61ef)
* [build-script] Separate SwiftTestinMacros from SwiftTesting product
Also, build them for all hosts including cross compiling host.
(cherry picked from commit e98c5eab6111801357176ef10992ec63eef5f071)
* [6.0] Add swift-testing to update-checkout-config.json
To release/6.0 scheme.
* [build-script] Fix product dependencies
SwiftPM now depends on `SwiftTesting`, `SwiftTesting` depends on
`SwiftTestingMacros`
rdar://133946466
(cherry picked from commit 852aa7798ff25c7ce50bdf7477f724fbc624662b)
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Co-authored-by: Stuart Montgomery <smontgomery@apple.com>
(cherry picked from commit 222fd1db3f53b08b1be47eeeb9ecbf84d47b3b50)
