fix(workflows): exclude block locked field from workflow diff comparison

Strip `locked` from blockRest in extractBlockFieldsForComparison so that
toggling block lock state does not trigger "changes detected" warnings.
The field was already removed from the explicit blockFields check but
still leaked through the full blockRest stringify comparison.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: waleedlatif1

apps/sim/lib/workflows/comparison/normalize.ts

@@ -398,6 +398,7 @@ export function extractBlockFieldsForComparison(block: BlockState): ExtractedBlo
     layout: _layout,
     height: _height,
     outputs: _outputs,
+    locked: _locked,
     is_diff: _isDiff,
     field_diffs: _fieldDiffs,
     ...blockRest