JavaScript: note removal of SEMMLE_TYPESCRIPT_HOME

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: b58bba12-96d2-40c2-aaf4-d249623a385c

Author: paldepind

javascript/ql/lib/change-notes/2026-10-22-remove-typescript-home.md

@@ -0,0 +1,4 @@
+---
+category: breaking
+---
+* The `SEMMLE_TYPESCRIPT_HOME` environment variable is no longer supported. The JavaScript/TypeScript extractor now always uses its bundled TypeScript compiler.