[6.2] Fix toolchain stack equality checks when checking if specialized targets are compatible#617
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Cherrypick of #615 to 6.2
When the downloadable Metal toolchain is installed in Xcode, it could cause specialization compatibility checks to fail, causing downstream errors specializing targets representing package plugins. This happened because the compatibility check compared the toolchains of SpecializationParameters with the TOOLCHAINS macro in the configured target's settings. We should use settings.toolchains on the RHS instead to ensure both sides of the comparison have a chance to inject the default toolchain during settings construction.
Closes #614
Closes #570