fix: delete csr when tenant has been deleted #1745

Job	Run time
govet (1.21.x, ubuntu-latest)	3m 2s
lint (1.21.x, ubuntu-latest)	4m 7s
Shellcheck (1.21.x)	21s
Check for vulnerable dependencies (1.21.x)	42s
gotest (1.21.x, ubuntu-latest)	3m 13s
operator (1.21.x, ubuntu-latest)	5m 22s
test-tenant (1.21.x, ubuntu-latest)	3m 24s
test-tenant-upgrade (1.21.x, ubuntu-latest)	4m 50s
test-cert-manager (1.21.x, ubuntu-latest)	3m 3s
test-kes (1.21.x, ubuntu-latest)	5m 25s
helm (1.21.x, ubuntu-latest)	3m 35s
helm-floor (1.21.x, ubuntu-latest)	3m 13s
test-policy-binding (1.21.x, ubuntu-latest)	6m 50s
	47m 7s

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