refactor: use reusable workflow for semgrep #822

Job	Run time
pre-commit	30s
meta	8s
compliance-copyrights	27s
fossa-scan	5m 3s
test-unit 3.7	1m 51s
test-unit 3.8	1m 23s
test-unit 3.9	1m 26s
test-unit 3.10	1m 20s
test-unit 3.11	1m 23s
semgrep / sast-scan	32s
test-splunk (9.3.0, 51ccf43db5bd, true, false)	3m 32s
test-splunk (9.2.2, d76edf6f0a15, false, false)	3m 37s
test-splunk (9.1.5, 29befd543def, false, true)	3m 32s
publish	1m 12s
	25m 56s

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