fix: strip quoted env var values before Zod validation #6003

Job	Run time
build-and-check	3m 3s
test-integration-packages/internal	1m 11s
test-integration-packages/billing	1m 9s
test-integration-packages/agent-runtime	44s
test-integration-sdk	1m 33s
test-integration-cli	48s
test-integration-common	51s
test-packages/billing	43s
test-integration-web	49s
test-packages/agent-runtime	44s
test-sdk	46s
test-.agents	42s
test-packages/internal	48s
test-cli	49s
test-common	49s
test-web	49s
	16m 18s

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