[6.2] FixItApplier: Misc improvements to `FixItApplier.apply` #265

Job	Run time
Validate generated code	2m 49s
Run tests using swift-syntax-dev-utils (Linux)	24m 14s
Run tests using swift-syntax-dev-utils (Windows)	44m 31s
Test / Linux (5.9 - jammy)	3m 53s
Test / Linux (6.1 - jammy)	4m 2s
Test / Linux (6.0 - jammy)	4m 17s
Test / Windows (6.1 - windows-2022)	13m 43s
Test / Linux (nightly-main - jammy)	4m 34s
Test / Windows (5.9 - windows-2022)	14m 19s
Test / Windows (6.0 - windows-2022)	12m 46s
Test / Linux (nightly-6.2 - jammy)	4m 36s
Test / Linux (5.10 - jammy)	3m 59s
Test / Windows (nightly - windows-2022)	13m 18s
Test / Windows (nightly-6.2 - windows-2022)	14m 3s
Soundness / Format check	42s
Soundness / Broken symlinks check	6s
Soundness / Shell check	33s
Soundness / Documentation check	4m 53s
Soundness / Unacceptable language check	6s
Soundness / YAML lint check	5s
Soundness / License headers check	12s
Soundness / Python lint check	8s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Soundness / API breakage check	0s
	2h 51m 49s

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