languages: Exclude angle brackets from rainbow bracket colorization for TSX (#51311)

## Summary

Angle brackets in TSX (`<`, `>`, `/>`, `</`) are always paired with JSX
tag syntax — they don't indicate bracket nesting depth — so rainbow
colorization adds noise without useful information.

This mirrors #46808, which applied the same fix to the HTML extension.

## Changes

- Added `(#set! rainbow.exclude)` to all three angle bracket patterns in
`crates/languages/src/tsx/brackets.scm`

## Before / After

Before: angle brackets in JSX tags receive rainbow colors alongside
`{}`, `()`, `[]`, making every tag visually noisy.

After: only `{}`, `()`, and `[]` receive rainbow colors — angle brackets
are excluded, matching the HTML extension behavior.

> Screenshots: I don't have a built copy of Zed handy to attach — happy
to add one if a maintainer needs it before merging.

Release Notes:

- Removed rainbow bracket colorization for angled brackets within TSX.

crates/languages/src/tsx/brackets.scm

@@ -7,14 +7,17 @@
 ("{" @open
   "}" @close)
 
-("<" @open
+(("<" @open
   ">" @close)
+  (#set! rainbow.exclude))
 
-("<" @open
+(("<" @open
   "/>" @close)
+  (#set! rainbow.exclude))
 
-("</" @open
+(("</" @open
   ">" @close)
+  (#set! rainbow.exclude))
 
 (("\"" @open
   "\"" @close)