schema/push: support desired schema URL(s) input (#240) #1002

Job	Run time
golangci-lint	2m 37s
shim	12s
shim-e2e	10s
unit-tests	1m 13s
migrate-down	32s
migrate-test	35s
schema-apply (lint-review)	32s
schema-apply (on-the-fly, true)	31s
schema-plan	0s
schema-plan-approve	26s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	27s
schema-push	33s
schema-apply (local-plan, file://20240910173744.plan.hcl)	28s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	27s
schema-test	32s
schema-apply (legacy, v0.27.0, true)	31s
	9m 46s

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