ci: check fixup commits are autosquashed before PR merge #6830

Job	Run time
Format check	39s
Linter	42s
Integration tests (windows-latest)	2m 7s
Unit tests (windows-latest)	2m 1s
Unit tests (ubuntu-latest)	40s
Integration tests (ubuntu-latest)	42s
Unit tests (macos-latest)	58s
Integration tests (macos-latest)	1m 17s
Build	1m 24s
E2E tests (windows-latest)	1m 45s
E2E tests (macos-latest)	1m 29s
E2E tests (ubuntu-latest)	44s
	14m 28s

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