build(shared): drop hard-coded chunk ignoreSubpaths

The five hashed chunk subpaths were pinned to rolldown content hashes
that rotate whenever a chunk's bytes change, so the list silently goes
stale and the phantom-chunk diff returns. The _chunks/ nesting in this
PR keeps internal chunks off the ./* public surface, and break-check's
ignoreHashedChunks heuristic (clerk/break-check#50, adopted in #8722)
drops -<hash> suffixed chunks generically on both baseline and current
snapshots, so the hand-maintained list is redundant.

Author: jacekradko

break-check.config.json

@@ -23,12 +23,5 @@
   "snapshotDir": ".api-snapshots",
   "mainBranch": "main",
   "checkVersionBump": true,
-  "outputFormat": "markdown",
-  "ignoreSubpaths": [
-    "./handleValueOrFn-BWsoUzyL",
-    "./index-CTKNTj8t",
-    "./moduleManager-BsmFyRrH",
-    "./url-BIKflgSC",
-    "./waitForElement-DZxkXjac"
-  ]
+  "outputFormat": "markdown"
 }