feat(jsx): update jsx to framework-agnostic logo

[va3y]

Addresses #2776

This PR replaces React icon for framework-agnostic JSX/TSX text. The used color is the same as for normal js/ts icons.

Many people use React and JSX, so I'll appreciate feedback from the community and maintainers about the idea.

What also bugs me is that vscode internally treats jsx as javascriptreact, and it can be seen in a language-selection window:

This maybe will needed to be addressed in the future, but I think replacing default icon is already a good step. This PR doesn't replace default namings in INativeLanguageCollection

Changes proposed:

• Add
• Delete
• Fix
• Prepare

[thetarnav]

For context, the language name for .jsx and .tsx was recently changed in vscode:
issue: microsoft/vscode#138285
PR: microsoft/vscode#168368

[Hacksore]

Including an example of all files togther to compare, I like this!

[hiteacheryouare]

Will there at least be a configuration option to keep it as the current react icon?

[JimiC]

@vscode-icons/development This makes total sense to me, since JSX and TSX is being used outside React itself. What we can do, to keep backwards compatibility, is to include this into the icon selection mechanism (you know, the old/new icons selector).

If we go down that path we will have to replace this RP but keep the icons.