Add `repos[].if_exists` run configuration option #5909

Job	Run time
build-docs / build-docs	1m 10s
compute-version	4s
build-artifacts / code-lint	47s
build-artifacts / frontend-build	10s
build-artifacts / runner-test (ubuntu-latest)	24s
build-artifacts / runner-test (macos-latest)	45s
build-artifacts / gateway-build	14s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	34s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	25s
build-artifacts / python-build	20s
build-artifacts / generate-json-schema	17s
build-artifacts / python-test (macos-latest, 3.9)	3m 41s
build-artifacts / python-test (macos-latest, 3.10)	2m 36s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 25s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 24s
build-artifacts / python-test (windows-latest, 3.11)	2m 26s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 22s
build-artifacts / python-test (macos-latest, 3.11)	3m 38s
build-artifacts / python-test (macos-latest, 3.13)	2m 52s
build-artifacts / python-test (windows-latest, 3.9)	1m 59s
build-artifacts / python-test (macos-latest, 3.12)	2m 47s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 24s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 25s
build-artifacts / python-test (windows-latest, 3.13)	2m 0s
build-artifacts / python-test (windows-latest, 3.12)	2m 18s
build-artifacts / python-test (windows-latest, 3.10)	4m 51s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	18s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	18s
	56m 54s

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