SPIFFE OIDC Discovery Provider Rework #707

Job	Run time
lint-chart	38s
checks	1m 4s
Build matrix	4s
test (v1.28.0)	21m 18s
example-test (v1.28.0, examples/external-postgresql)	3m 56s
test (v1.27.3)	20m 33s
example-test (v1.28.0, examples/nested)	4m 1s
test (v1.26.6)	21m 45s
example-test (v1.28.0, examples/external-mysql)	4m 12s
example-test (v1.28.0, examples/tornjak)	3m 1s
example-test (v1.28.0, examples/production)	6m 4s
upgrade-test (v1.28.0)	10m 13s
example-test (v1.27.3, examples/external-postgresql)	3m 53s
upgrade-test (v1.27.3)	10m 18s
example-test (v1.27.3, examples/nested)	4m 10s
upgrade-test (v1.26.6)	9m 41s
example-test (v1.27.3, examples/external-mysql)	4m 0s
example-test (v1.27.3, examples/tornjak)	3m 23s
example-test (v1.27.3, examples/production)	6m 10s
example-test (v1.26.6, examples/external-postgresql)	3m 15s
example-test (v1.26.6, examples/nested)	4m 20s
example-test (v1.26.6, examples/external-mysql)	3m 44s
example-test (v1.26.6, examples/tornjak)	3m 16s
example-test (v1.26.6, examples/production)	6m 10s
	2h 39m 9s

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