Add support for enabling the spire-agent admin socket #1090

Job	Run time
checks	24s
lint-chart	33s
Build matrix	4s
test (v1.28.0)	16m 18s
upgrade-test (v1.28.0)	6m 11s
test (v1.27.3)	16m 48s
example-test (v1.28.0, examples/external-postgresql)	3m 16s
upgrade-test (v1.27.3)	8m 53s
test (v1.26.6)	18m 5s
example-test (v1.28.0, examples/federation)	3m 58s
upgrade-test (v1.26.6)	6m 7s
example-test (v1.28.0, examples/production)	6m 11s
example-test (v1.28.0, examples/tornjak)	3m 2s
example-test (v1.28.0, examples/external-mysql)	3m 46s
example-test (v1.28.0, examples/nested)	3m 48s
example-test (v1.27.3, examples/external-postgresql)	3m 17s
example-test (v1.27.3, examples/federation)	3m 59s
example-test (v1.27.3, examples/production)	6m 7s
example-test (v1.27.3, examples/tornjak)	3m 5s
example-test (v1.27.3, examples/external-mysql)	3m 54s
example-test (v1.27.3, examples/nested)	3m 58s
example-test (v1.26.6, examples/external-postgresql)	3m 16s
example-test (v1.26.6, examples/federation)	3m 48s
example-test (v1.26.6, examples/production)	6m 13s
example-test (v1.26.6, examples/tornjak)	3m 15s
example-test (v1.26.6, examples/external-mysql)	3m 18s
example-test (v1.26.6, examples/nested)	3m 17s
	2h 24m 51s

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