chore: untrack committed tsconfig.tsbuildinfo build artifacts

TypeScript incremental build state was checked in for apps/cms and
apps/web-next; it churns on every build and carries no source value.
Remove from tracking and ignore *.tsbuildinfo repo-wide.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -10,6 +10,9 @@ node_modules
 # Turbo
 .turbo
 
+# TypeScript incremental build state
+*.tsbuildinfo
+
 # Build outputs
 dist
 build