atlasaction: base64url encoding for plan's filename #1025

Job	Run time
migrate-down	33s
golangci-lint	3m 21s
migrate-test	30s
schema-apply (lint-review)	2m 38s
schema-plan	31s
schema-apply (on-the-fly, true)	27s
schema-plan-approve	0s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	34s
schema-push	29s
schema-test	27s
schema-apply (local-plan, file://20240910173744.plan.hcl)	28s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	34s
shim	11s
shim-e2e	7s
unit-tests	1m 31s
schema-apply (legacy, v0.27.0, true)	28s
	12m 49s

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