chore: add auto-publishing for workspace PRs

[Zaperex]

Description

• Modified the PR workflow to also allow for auto-publishing when PR is created/updated
• Added authentication to ensure only rhdh team members are allowed to trigger commands/builds

Fixes RHIDP-9449

This modification will require the addition of a github app in the GH actions secret after PR is merged to function correctly.

[github-actions]

The file versions.json could not be synced from branch main into this because your PR is from a fork.

You should update the versions.json file with the following content:

{
    "backstage": "1.45.3",
    "node": "22.19.0",
    "cli": "1.9.0",
    "cliPackage": "@red-hat-developer-hub/cli"
}

[github-actions]

The file versions.json could not be synced from branch main into this because your PR is from a fork.

You should update the versions.json file with the following content:

{
    "backstage": "1.45.3",
    "node": "22.19.0",
    "cli": "1.9.1",
    "cliPackage": "@red-hat-developer-hub/cli"
}

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot
C Security Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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