Fix YAML syntax issues in workflow triggers and validate implementation

Co-authored-by: darthkali <46423967+darthkali@users.noreply.github.com>

Author: Copilot

.github/workflows/main.yaml

@@ -1,7 +1,7 @@
 ---
 name: Main Pipeline
 
-on:
+"on":
   push:
     branches: [ "**" ]
   pull_request:

.github/workflows/security-scan.yaml

@@ -1,7 +1,7 @@
 ---
 name: Security Scan
 
-on:
+"on":
   pull_request:
     branches: [ main ]
   workflow_dispatch:

.github/workflows/test.yaml

@@ -1,6 +1,6 @@
 name: Test
 
-on:
+"on":
   workflow_dispatch:
   workflow_call: