remove checks for self closing tags

[ceymard]

What does this PR do?

This fixes #14515 by simply stopping the checks with self-closing tags in jsx, as it should not be bun's responsibility to do so. I can update the tests, but I'm not familiar with the structure, can I just drop a jsx or tsx file in tests/snippets ?

This is just code removal and very little is touched in the .zig. The use case I give in #14515 passes.

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

• I checked the lifetime of memory allocated to verify it's (1) freed and (2) only freed when it should be
• I included a test for the new code, or an existing test covers it
• JSValue used outside outside of the stack is either wrapped in a JSC.Strong or is JSValueProtect'ed
• I wrote TypeScript/JavaScript tests and they pass locally (bun-debug test test-file-name.test)