Add validating admission policy to restrict upstream driver access #2133

Job	Run time
Build matrix	3s
checks	3m 5s
lint-chart	31s
test (v1.31.1)	19m 46s
integration-test (v1.31.1, tests/integration/production)	5m 56s
test (v1.30.4)	19m 12s
example-test (v1.31.1, examples/external-mysql)	3m 35s
integration-test (v1.30.4, tests/integration/production)	6m 5s
test (v1.29.8)	19m 47s
example-test (v1.31.1, examples/nested-security)	7m 34s
integration-test (v1.29.8, tests/integration/production)	6m 6s
upgrade-test (v1.31.1)	8m 32s
example-test (v1.31.1, examples/tornjak)	2m 49s
upgrade-test (v1.30.4)	6m 5s
example-test (v1.31.1, examples/nested-full)	6m 51s
upgrade-test (v1.29.8)	6m 4s
example-test (v1.31.1, examples/external-postgresql)	2m 46s
example-test (v1.31.1, examples/federation)	3m 32s
example-test (v1.31.1, examples/stateless-server)	3m 4s
example-test (v1.30.4, examples/external-mysql)	3m 53s
example-test (v1.30.4, examples/nested-security)	6m 9s
example-test (v1.30.4, examples/tornjak)	3m 2s
example-test (v1.30.4, examples/nested-full)	7m 6s
example-test (v1.30.4, examples/external-postgresql)	3m 16s
example-test (v1.30.4, examples/federation)	4m 26s
example-test (v1.30.4, examples/stateless-server)	3m 8s
example-test (v1.29.8, examples/external-mysql)	3m 42s
example-test (v1.29.8, examples/nested-security)	5m 8s
example-test (v1.29.8, examples/tornjak)	2m 52s
example-test (v1.29.8, examples/nested-full)	9m 21s
example-test (v1.29.8, examples/external-postgresql)	3m 12s
example-test (v1.29.8, examples/federation)	3m 30s
example-test (v1.29.8, examples/stateless-server)	3m 11s
	3h 13m 19s

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