Added required as false to mns vlidation flag in e2e pipeline (#1377)

* converted string to boolean in default mns vlidation flag

* added required as false and changed back to string

Author: avshetty1980

.github/workflows/run-e2e-automation-tests.yml

@@ -71,7 +71,8 @@ on:
       mns_validation_required:
         description: Set to true if you want the MNS validation to be performed as part of the tests. please keep in mind it will increase execution time.
         default: "false"
-        type: boolean
+        required: false
+        type: string
 
 env:
   APIGEE_AUTH_ENV: ${{ inputs.apigee_environment == 'int' && inputs.apigee_environment || 'internal-dev' }}