[Tooling] Use `buildkite_pipeline_upload` action to inline Buildkite release pipelines

[iangmaia]

Description

iOS counterpart: https://github.com/wordpress-mobile/WordPress-iOS/pull/23782 Related: pdccJN-xR-p2

This PR uses the release-toolkit action buildkite_pipeline_upload implemented on https://github.com/wordpress-mobile/release-toolkit/pull/597.

Our release pipelines (such as complete-code-freeze, finalize-release, etc) usually require to start a separate pipeline to make a release build. The changes in this PR will result in add the steps of a release pipeline to the currently running build, without starting a new build altogether.

Testing information

Testing information

I've added (and later reverted) a test commit 95c00cf720d596d59559e56335d5b42ca311e1b0 to test the complete_code_freeze lane.

This is a test build created using the Buildkite Web UI directly with PIPELINE=complete-code-freeze.yml:

• https://buildkite.com/automattic/wordpress-android/builds/20364

This PR can be tested in a similar way to the test above: creating a branch off this one, slightly modifying a release lane to prevent side effects and running the build directly on Buildkite.

[dangermattic]

	1 Warning
:warning:	This PR is assigned to the milestone 25.5. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

Generated by :no_entry_sign: Danger

[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	pr21437-accc6e3
	Commit	accc6e306151dc8d77a2abad4d082486ecd85d3c
	Direct Download	jetpack-prototype-build-pr21437-accc6e3.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	pr21437-accc6e3
	Commit	accc6e306151dc8d77a2abad4d082486ecd85d3c
	Direct Download	wordpress-prototype-build-pr21437-accc6e3.apk

Note: Google Login is not supported on these builds.

[sonarcloud[bot]]

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 SonarCloud

[iangmaia]

Looking good.

I noticed there are two pipelines one for betas and one for releases. The difference seems to be minimal, so I wonder if it'd be worth logging a task to consolidate them [...] The main difference is in which Fastlane lane they call, but I think that can be tidied up with a lane consolidation, too.

I've also noticed the same! Also the priority is another difference (not big enough to have different pipeline files, if you ask me). All other projects follow the approach of a single pipeline, so I agree this is an improvement here that can be done on another PR.