Remove `immediate_hydration` feature from everywhere at the codebase

[AbanoubGhadban]

A bug is a crash or incorrect behavior. If you have a debugging or troubleshooting question, please open a discussion.

Environment

1. Ruby version:
2. Rails version:
3. Shakapacker/Webpacker version:
4. React on Rails version:

Expected behavior

Actual behavior

Small, reproducible repo

[coderabbitai]

Related Issues

• Tiffany0909 #1733: Tiffany0909
• Add retries plugin to the HTTPX connection and remove the redundant connection used for streamed components #1994: Add retries plugin to the HTTPX connection and remove the redundant connection used for streamed components
• Investigate why the ImageExample test fails #1990: Investigate why the ImageExample test fails
• Investigate if the description closed error is caused by HTTPx or fastify #1969: Investigate if the description closed error is caused by HTTPx or fastify
• Investigate why serverRenderRSCReactComponent function hangs forever at testing environment #1891: Investigate why serverRenderRSCReactComponent function hangs forever at testing environment

Suggested Issue Assignees

• AbanoubGhadban
• Tiffany0909

Actions

• 🗺️ Generate an implementation plan for this issue

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[justin808]

The original plan was to completely remove this in v17, so it can be done in a v17 branch.

BTW -- issues need more details.