[6.2] FixItApplier: Misc improvements to FixItApplier.apply
#3123
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swift package migrate, this will enable us to prevent repeated fix-it application in various scenarios where multiple elements in a protocol composition type are diagnosed with the same insertion fix-it.FixItApplierSPI, used by internal testing facilities and in SwiftPM byswift package migrateand the variousswift package add-*commands.