Added skip checkout input

[goruha]

what

• Add skip checkout input

why

• To be consistent with the Plan and apply actions that now allow to skip checkout

references

• Replace describe-config for atmos-get-setting, add optional cache and azure storage options github-action-atmos-terraform-plan#92
• Replace describe-config for atmos-get-setting, add optional cache and azure storage options github-action-atmos-terraform-apply#62
• Skip AWS auth if Gitops aws configuration empty in atmos settings github-action-atmos-terraform-drift-remediation#21

[github-actions]

These changes were released in v4.0.0.