getPullRequestEditedDiffRanges: use GitHub API #6268

Job	Run time
Packaging: Config file (macos-latest, linked)	1m 24s
Packaging: Config file (ubuntu-latest, default)	59s
Packaging: Config file (windows-latest, linked)	4m 13s
Packaging: Config file (windows-latest, default)	5m 22s
Packaging: Config file (windows-latest, nightly-latest)	2m 50s
Packaging: Config file (ubuntu-latest, linked)	53s
Packaging: Config file (macos-latest, default)	1m 21s
Packaging: Config file (macos-latest, nightly-latest)	1m 18s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 3s
	19m 23s

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