feat: Get available versions for a given app scope

[SapphicFire]

This PR introduces an action to get available versions of an application based on its Scope ID.

Input:

• Scope ID (string): An example is sn_coupa_spoke

Outputs:

• Version count (integer): Number of version records available
• Message (string): Advises if ID is invalid or user friendly message of Scope installed and count
• Versions (GlideList - Records.sys_app_version): List of GlideRecords representing the version records
• Scope installed (Boolean): True if the scope is currently installed, false if not

[github-actions]

✅ Valid PR for ActionPack

Thank you for your contribution. This PR complies with the CONTRIBUTING.md.
A maintainer will review this shortly. In the meantime, Happy Hacking!