Fix `upload-sarif` Action failing if there are no Code Scanning SARIF files #5704

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 15s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 20s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	1m 54s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 58s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 1s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 11s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	2m 3s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 13s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 35s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 28s
Go: tracing with custom build steps (ubuntu-latest, default)	57s
Go: tracing with custom build steps (macos-latest, linked)	2m 51s
Go: tracing with custom build steps (macos-latest, default)	2m 45s
Go: tracing with custom build steps (ubuntu-latest, linked)	50s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 54s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 57s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 15s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	55s
	33m 22s

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