schema/plan/approve: distinct action for approve the plan #969

Job	Run time
golangci-lint	24s
migrate-down	30s
migrate-test	22s
schema-plan	18s
schema-apply (lint-review)	19s
schema-push	24s
schema-apply (on-the-fly, true)	20s
schema-test	26s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	19s
shim	15s
schema-apply (local-plan, file://20240910173744.plan.hcl)	17s
shim-e2e	11s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	19s
unit-tests	1m 18s
schema-apply (legacy, v0.27.0, true)	25s
	6m 7s

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