[Enabler][692] Add a command that checks the changelog into ac and create a GitHub action

[IsaacVRey]

SUMMARY

This PR fixes the first two bullet points of https://github.com/ansible-collections/ibm_zos_core/issues/692.

Add new command ac-check-changelog into ac tool to ensure if a new changelog fragment was added to the branch

Added new github action that will execute the check changelog check upon a new pull request with base branch dev or any branch that starts with staging. By default, it will run on three triggers:

• open
• synchronize (every time the branch, with its PR in draft mode or ready for review gets a new push into remote).
• reopen

You can see this Github Action in the following PR https://github.com/fernandofloresg/ibm_zos_core/pull/24 And look at the run details here https://github.com/fernandofloresg/ibm_zos_core/actions/runs/8574374819/job/23501055062?pr=24

It averages 12s of execution time.

And looking at billable details we get 0s,

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

ac

ADDITIONAL INFORMATION