monitor/schema: support using atlas hcl file in monitor action #1389

Job	Run time
golangci-lint	13s
shim	11s
migrate-test	11s
shim-e2e	6s
unit-tests	1m 30s
migrate-down	25s
schema-apply (lint-review)	9s
schema-plan	15s
schema-apply (on-the-fly, true)	7s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	10s
schema-push	14s
schema-test	8s
schema-apply (local-plan, file://20240910173744.plan.hcl)	21s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	13s
schema-apply (legacy, v0.27.0, true)	8s
monitoring	39s
schema-plan-approve	0s
	5m 0s

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