JS: Move ClassifyFiles.qll to library pack

This allows us to use this library in packs that depend on the
`codeql/javascript-all` library pack.

Author: henrymercer

javascript/ql/src/filters/ClassifyFiles.qll renamed to javascript/ql/lib/semmle/javascript/filters/ClassifyFiles.qll

@@ -55,7 +55,7 @@
 
 import javascript
 private import DataFlow
-private import filters.ClassifyFiles
+private import semmle.javascript.filters.ClassifyFiles
 private import semmle.javascript.RestrictedLocations
 
 /**

javascript/ql/src/experimental/poi/PoI.qll

@@ -8,7 +8,7 @@
  */
 
 import javascript
-import ClassifyFiles
+import semmle.javascript.filters.ClassifyFiles
 
 from File f, string category
 where classify(f, category)