Fix `upload-sarif` Action failing if there are no Code Scanning SARIF files #5700

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 8s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 8s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	3m 27s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 5s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 1s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 14s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	3m 26s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 5s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 4s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 8s
Go: tracing with custom build steps (ubuntu-latest, default)	57s
Go: tracing with custom build steps (macos-latest, linked)	2m 27s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	1m 2s
Go: tracing with custom build steps (macos-latest, default)	2m 30s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 9s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 29s
Go: tracing with custom build steps (ubuntu-latest, linked)	1m 3s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	3m 36s
	33m 59s

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