Partner Portal: Add a dummy page for the upcoming Billing Dashboard

[atanas-dev]

Context: p1HpG7-bsW-p2

This is a split from #51692 to introduce the new page and route changes.

Changes proposed in this Pull Request

• Add a dummy page for the upcoming Billing Dashboard in the development environment only.

Testing instructions

• If you do not have a partner key, please contact Infinity for one or you will be unable to view test this PR.
• Check out this PR locally, then run yarn && yarn start-jetpack-cloud.
• The license listing was moved to /partner-portal/licenses - this PR should not affect the behavior except to make sure all relevant redirects lead to /partner-portal/licenses instead of /partner-portal (e.g. issuing licenses, filtering the license list, pagination etc.).
• A new Billing page with placeholder data should now be the default page for the Partner Portal.
• Make sure the UI matches the designs.

[matticbot]

Test live: https://calypso.live/?branch=add/partner-portal-billing-dashboard-dummy-page

[matticbot]

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

App Entrypoints (~4 bytes removed 📉 [gzipped])

name        parsed_size           gzip_size
entry-main        +36 B  (+0.0%)       -4 B  (-0.0%)

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

Sections (~6170 bytes added 📈 [gzipped])

name                          parsed_size            gzip_size
jetpack-cloud-partner-portal     +26406 B  (+22.9%)    +6170 B  (+17.6%)

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.

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/5713393

Thank you @atanas-dev for including a screenshot in the description! This is really helpful for our translators.

[a8ci18n]

Translation for this Pull Request has now been finished.