[CI] Disable backward compatibility check

At the moment, we have no history to diff against, resulting in an error

> Error loading nodes: Could not find __init__.py in base_repo

This commit should be reverted once the initial node implementation has
been merged to main.

Signed-off-by: David Feltell <[email protected]>

Author: feltech

.github/workflows/validate.yml

@@ -10,8 +10,9 @@ on:
       - master
       - main
 
-jobs:
-  validate:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: comfy-org/node-diff@main
+# TODO(DF): Re-enable once initial PR merged to set a baseline.
+#jobs:
+#  validate:
+#    runs-on: ubuntu-latest
+#    steps:
+#      - uses: comfy-org/node-diff@main