Stepper: ignore ref changes when customizing calypso_signup_start

[alshakero]

Testing Instructions

1. Go to 22138-explat-experiment
2. Save the treatment bookmarklet.
3. While incognito, go to Calypso My Home / (don't go to the flow URL, the experiment assignment will be cached).
4. Open DevTools > Network and filter by calypso_signup_start.
5. Click the bookmarklet.
6. Visit /setup/onboarding?ref=lohp.
7. You should see a single instance of calypso_signup_start.
8. Go on to sign up.
9. After auth, you shouldn't seemore instances of calypso_signup_start.

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129534

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129534&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129534&env=a8c-for-agencies

[matticbot]

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

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

• notifications

To test WordPress.com changes, run install-plugin.sh $pluginSlug tracks/ignore-ref-changes on your sandbox.

[matticbot]

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

App Entrypoints (~0 bytes added 📈 [gzipped])

name           parsed_size           gzip_size
entry-stepper        +39 B  (+0.0%)       +0 B

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.