Remove automatic triggers from parent workflow to avoid duplicate runs

The parent workflow (GAIA CLI Tests) was competing with standalone child
workflows, causing concurrency conflicts and cancelled jobs. Each child
workflow already triggers independently on push/pull_request, so the
parent is now only available via workflow_call or manual dispatch.

Author: kovtcharov

.github/workflows/test_gaia_cli.yml

@@ -8,13 +8,10 @@
 name: GAIA CLI Tests (All Platforms)
 
 on:
+  # Only run via workflow_call or manual dispatch
+  # Individual child workflows (test_unit.yml, test_code_agent.yml, etc.) trigger
+  # on push/pull_request independently - this avoids duplicate/conflicting runs
   workflow_call:
-  push:
-    branches: [ main ]
-  pull_request:
-    branches: [ main ]
-    types: [opened, synchronize, reopened, ready_for_review]
-  merge_group:
   workflow_dispatch:
 
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