Add `repos[].if_exists` run configuration option #5916

Job	Run time
compute-version	4s
build-docs / build-docs	1m 19s
build-artifacts / gateway-build	15s
build-artifacts / code-lint	48s
build-artifacts / frontend-build	9s
build-artifacts / runner-test (ubuntu-latest)	33s
build-artifacts / runner-test (macos-latest)	45s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	28s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	22s
build-artifacts / python-build	26s
build-artifacts / generate-json-schema	22s
build-artifacts / python-test (macos-latest, 3.9)	2m 14s
build-artifacts / python-test (macos-latest, 3.12)	3m 0s
build-artifacts / python-test (macos-latest, 3.13)	2m 54s
build-artifacts / python-test (macos-latest, 3.10)	2m 10s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 22s
build-artifacts / python-test (macos-latest, 3.11)	3m 6s
build-artifacts / python-test (windows-latest, 3.13)	1m 58s
build-artifacts / python-test (windows-latest, 3.10)	2m 6s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 20s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 21s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 33s
build-artifacts / python-test (windows-latest, 3.11)	2m 10s
build-artifacts / python-test (windows-latest, 3.9)	1m 48s
build-artifacts / python-test (windows-latest, 3.12)	1m 52s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 8s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	20s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	21s
	51m 14s

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