[Tooling] Automate GitHub release publishing for beta builds

[iangmaia]

Reference: pdnsEh-24G-p2

• iOS counterpart PR: [Tooling] Automate GitHub release publishing for beta builds WordPress-iOS#24176
• ReleasesV2 PR: https://github.a8c.com/Automattic/wpcom/pull/176420

Description

This PR updates the create_gh_release lane to automate the publishing of beta builds:

• Beta releases: Set as prerelease=true and draft=false to publish immediately as a pre-release
• Final releases: Set as prerelease=false and draft=true to create as a draft until we get Apple approval and can publish it

Testing Steps

We'll be able to fully verify this works as expected during the next WP Android release cycle.

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21745-94ca6dd
	Commit	94ca6dd
	Direct Download	jetpack-prototype-build-pr21745-94ca6dd.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21745-94ca6dd
	Commit	94ca6dd
	Direct Download	wordpress-prototype-build-pr21745-94ca6dd.apk

Note: Google Login is not supported on these builds.