Reader: Pass header content to Stream components

[DustyReagan]

Related to https://github.com/Automattic/loop/issues/296

Proposed Changes

• Pass user profile header and navigation from UserStream component to both UserPosts and UserLists components as children
• Add children prop to UserPosts and UserLists components to accept header content
• Refactor UserStream to extract header content into a shared variable

Why are these changes being made?

• Fixes layout issue where the Stream component's content was being cut off at the bottom of the page (visible after applying this change Reader: Check for missing pageHandle in lastPage stream reducer #98046)
• Aligns with Stream component's design pattern, where header content is passed as children to Stream

Testing Instructions

• Assuming the infinite API loop is fixed with this change Reader: Check for missing pageHandle in lastPage stream reducer #98046
• Using Calypso Live go to /read/users/218803706
• You should be able to see the W icon at the bottom of the Stream signifying there are no more posts
• Go to /read/users/132828356 to view profile with no posts. The W icon should not be visible.

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-129499

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129499&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-129499&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
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug loop-269/pass-header-content-to-stream-components on your sandbox.

[matticbot]

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

Async-loaded Components (~55 bytes added 📈 [gzipped])

name                                   parsed_size           gzip_size
async-load-calypso-reader-user-stream       +247 B  (+6.3%)      +55 B  (+3.5%)

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.

[mehmoodak]

I have made following minor changes in the PR:

• 0800fac - Improve spacing and remove extra properties which we don't want now due to change of the structure.

• 9256ed9 - Move header styles to its dedicated file