FixItApplier: Misc improvements #261

Job	Run time
Run tests using swift-syntax-dev-utils (Windows)	38m 44s
Validate generated code	3m 1s
Run tests using swift-syntax-dev-utils (Linux)	24m 0s
Test / Windows (6.1 - windows-2022)	14m 53s
Test / Windows (6.0 - windows-2022)	13m 11s
Test / Windows (nightly - windows-2022)	13m 1s
Test / Windows (nightly-6.2 - windows-2022)	14m 29s
Test / Windows (5.9 - windows-2022)	14m 39s
Test / Linux (6.0 - jammy)	4m 11s
Test / Linux (5.9 - jammy)	4m 2s
Test / Linux (6.1 - jammy)	4m 10s
Test / Linux (5.10 - jammy)	3m 51s
Test / Linux (nightly-6.2 - jammy)	4m 56s
Test / Linux (nightly-main - jammy)	4m 46s
Test / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
Soundness / License headers check	12s
Soundness / YAML lint check	4s
Soundness / Documentation check	4m 55s
Soundness / Unacceptable language check	4s
Soundness / Broken symlinks check	6s
Soundness / Format check	43s
Soundness / Shell check	36s
Soundness / Python lint check	8s
Soundness / API breakage check	0s
	2h 48m 42s

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