Introduction To React Testing: Remove redundant section

[nikitarevenco]

Because

There is a section that was more relevant when React course first released, and relevant now. I've removed it

This PR

• Removes unnecessary section

Issue

Closes #27561

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[MaoShizhong]

Thanks for getting this done, @nikitarevenco

2 things:

1. Could you get the linting errors in this file fixed up? I'm sure you'll have no troubles doing this. For the fenced code-block language, bash would be most suitable, and the link fragment that is currently set to #setting-up can be changed to #setting-up-a-react-testing-environment.
2. At the end of line 126 ("The tests speak for themselves..."), could you append the following sentence?

Notice that the callback function for the second test is an async one, as we need this in order to await user.click().

Even though we don't really need to go through the v14.0.0 changes specifically anymore, I still think it'll be good to bring attention to that callback being an async one as a little reminder just in case.

[nikitarevenco]

Thanks for getting this done, @nikitarevenco

2 things:

1. Could you get the linting errors in this file fixed up? I'm sure you'll have no troubles doing this. For the fenced code-block language, bash would be most suitable, and the link fragment that is currently set to #setting-up can be changed to #setting-up-a-react-testing-environment.
2. At the end of line 126 ("The tests speak for themselves..."), could you append the following sentence?

Notice that the callback function for the second test is an async one, as we need this in order to await user.click().

Even though we don't really need to go through the v14.0.0 changes specifically anymore, I still think it'll be good to bring attention to that callback being an async one as a little reminder just in case.

Yeah, I agree that needed some clarification. I've made the changes

[MaoShizhong]

Just the backtick thing then otherwise this should be good to merge 🚀