Reader: Add utils for user profile

[mehmoodak]

Related to https://github.com/Automattic/loop/issues/273

Proposed Changes

We are currently hardcoding the names of user profile feature flags and URLs in various places. To improve maintainability, added isUserProfileEnabled and getUserProfileUrl util functions.

This also helps prevent unwanted typos.

Why are these changes being made?

To improve maintainability and consistency.

Testing Instructions

• Go to user profile page (example) and verify that the page is working as expected.
• Go to /read and verify author profile links are working as expected.

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-129779

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129779&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129779&env=a8c-for-agencies

[matticbot]

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

Sections (~183 bytes added 📈 [gzipped])

name                             parsed_size           gzip_size
reader                                +534 B  (+0.0%)     +183 B  (+0.0%)
write-flow                            +508 B  (+0.0%)     +175 B  (+0.0%)
plugins                               +508 B  (+0.0%)     +175 B  (+0.0%)
link-in-bio-tld-flow                  +508 B  (+0.0%)     +175 B  (+0.0%)
jetpack-cloud-plugin-management       +508 B  (+0.0%)     +175 B  (+0.0%)
home                                  +508 B  (+0.0%)     +175 B  (+0.0%)
build-flow                            +508 B  (+0.0%)     +175 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.

Async-loaded Components (~172 bytes added 📈 [gzipped])

name                                                 parsed_size           gzip_size
async-load-calypso-components-web-preview-component       +508 B  (+0.1%)     +175 B  (+0.1%)
async-load-design-blocks                                  +472 B  (+0.0%)     +172 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

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.

[matticbot]

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

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

• blaze-dashboard
• command-palette-wp-admin
• help-center
• notifications
• odyssey-stats
• whats-new

To test WordPress.com changes, run install-plugin.sh $pluginSlug reader/add-user-profile-utils on your sandbox.