fix: remove .git extension when checking for remote existence #586

Job	Run time
Test (windows-2022, llvm, true)	10m 57s
Test (windows-2022, llvm, true)	10m 57s
Test (windows-2022, gcc, true)	11m 59s
Test (windows-2022, gcc, true)	11m 59s
Test (ubuntu-22.04, llvm, true)	6m 18s
Test (ubuntu-22.04, llvm, true)	6m 18s
Test (ubuntu-22.04, gcc, true)	3m 37s
Test (ubuntu-22.04, gcc, true)	5m 43s
Test (macos-13, llvm, true)	10m 33s
Test (macos-13, llvm, true)	10m 33s
Test (macos-13, gcc, true)	10m 30s
Test (macos-13, gcc, true)	10m 30s
Test (windows-2022, msvc, true)	9m 58s
Test (windows-2022, msvc, true)	9m 58s
Test (windows-2022, msvc, true, Ninja)	9m 56s
Test (windows-2022, msvc, true, Ninja)	9m 56s
Test (windows-2022, msvc, false, Ninja)	8m 47s
Test (windows-2022, msvc, false, Ninja)	8m 47s
Test (windows-2022, msvc, false)	10m 57s
Test (windows-2022, msvc, false)	10m 57s
	3h 9m 10s

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