fix: delete csr when tenant has been deleted #1741

Job	Run time
govet (1.21.x, ubuntu-latest)	1m 46s
lint (1.21.x, ubuntu-latest)	2m 32s
Shellcheck (1.21.x)	26s
Check for vulnerable dependencies (1.21.x)	58s
operator (1.21.x, ubuntu-latest)	3m 30s
gotest (1.21.x, ubuntu-latest)	3m 10s
test-tenant-upgrade (1.21.x, ubuntu-latest)	5m 15s
test-cert-manager (1.21.x, ubuntu-latest)	3m 7s
helm-floor (1.21.x, ubuntu-latest)	3m 20s
test-kes (1.21.x, ubuntu-latest)	5m 3s
test-policy-binding (1.21.x, ubuntu-latest)	6m 25s
test-tenant (1.21.x, ubuntu-latest)	2m 55s
helm (1.21.x, ubuntu-latest)	2m 56s
	41m 23s

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