atlasaction: move github client to internal package (#286) #1336

Job	Run time
migrate-down	20s
golangci-lint	14s
migrate-test	11s
monitoring	33s
schema-apply (lint-review)	7s
schema-apply (on-the-fly, true)	14s
schema-plan	0s
schema-plan-approve	14s
schema-apply (remote-repo, atlas://atlas-action/plans/20240910183610, atlas://atlas-action?tag=e2e)	7s
schema-push	13s
schema-apply (local-plan, file://20240910173744.plan.hcl)	14s
schema-test	15s
schema-apply (multiple-envs, file://20240910173744.plan.hcl)	7s
shim	11s
schema-apply (legacy, v0.27.0, true)	7s
shim-e2e	5s
unit-tests	1m 11s
	4m 23s

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