Remove calypso_onboarding_goals_step_added_goals experiment

[p-jackson]

Proposed Changes

Removes code for assigning experiment participants, and any code that used the old control variant.

• Removes calypso_onboarding_goals_step_added_goals assignment code
• Removes code used by the control variant, since it's now dead code

Why are these changes being made?

We're wrapping up the experiment p1733606517185389-slack-C07H21B2W59

We've collected plenty of data on the difference between the two experiences, and having the extra variation is going to add too many permutations to deal with while working on #96905

Testing Instructions

• Smoke test the site-setup flow. There should be no changes from the existing treatment experience.

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-126854

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-126854&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-126854&env=a8c-for-agencies

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

App Entrypoints (~24 bytes removed 📉 [gzipped])

name                 parsed_size           gzip_size
entry-subscriptions        -90 B  (-0.0%)      -24 B  (-0.0%)
entry-stepper              -90 B  (-0.0%)      -24 B  (-0.0%)
entry-main                 -90 B  (-0.0%)      -24 B  (-0.0%)
entry-login                -90 B  (-0.0%)      -24 B  (-0.0%)

Common code that is always downloaded and parsed every time the app is loaded, no matter which route is used.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory.
Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[zaguiini]

Looks good to me!

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug remove/added-goals-test on your sandbox.