Release newsletter goal launchpad tasks

[p-jackson]

Related to #98305

Proposed Changes

This change removes the feature flag for the newsletter goal from the
onboarding flow. The flag is no longer necessary as the feature we are
enabling the feature for all users.

I left the ability to mock feature flags in the goalsToIntent(). Seems
like it could be useful in the future.

Why are these changes being made?

• The CfT didn't raise anything that was a blocker for the newsletter goal specifically.

Testing Instructions

• Follow the CfT instructions pdtkmj-3k2-p2 (except the ?flags=onboarding/newsletter-goal query param will now be ignored)

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-132388

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132388&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-132388&env=a8c-for-agencies

[matticbot]

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

Sections (~66 bytes removed 📉 [gzipped])

name             parsed_size           gzip_size
onboarding-flow       -133 B  (-0.1%)      -20 B  (-0.0%)
site-setup-wg          -93 B  (-0.0%)      -46 B  (-0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

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.