monitor/schema: support using atlas hcl file in monitor action #1397

Job	Run time
migrate-test	21s
golangci-lint	10s
schema-test	9s
shim	13s
shim-e2e	8s
unit-tests	1m 12s
migrate-down	21s
schema-apply (lint-review)	13s
monitoring	43s
schema-apply (on-the-fly, true)	14s
schema-plan	16s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	20s
schema-apply (local-plan, file://20240910173744.plan.hcl)	15s
schema-push	14s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	9s
schema-apply (legacy, v0.27.0, true)	15s
schema-plan-approve	0s
	5m 13s

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