JS: Remove ML model pack from default workspace

We only want to put the checked out version of the model pack to test a
custom model.
Given that the repo doesn't contain any models by default, most users
won't want the local checkout of the model pack to override the one
downloaded from the package registry.

Author: henrymercer

.codeqlmanifest.json

@@ -6,7 +6,6 @@
         "*/ql/examples/qlpack.yml",
         "cpp/ql/test/query-tests/Security/CWE/CWE-190/semmle/tainted/qlpack.yml",
         "javascript/ql/experimental/adaptivethreatmodeling/lib/qlpack.yml",
-        "javascript/ql/experimental/adaptivethreatmodeling/model/qlpack.yml",
         "javascript/ql/experimental/adaptivethreatmodeling/modelbuilding/qlpack.yml",
         "javascript/ql/experimental/adaptivethreatmodeling/src/qlpack.yml",
         "csharp/ql/campaigns/Solorigate/lib/qlpack.yml",