Use triage bot PAT for TPI validator so comments come from bot (microsoft#157944)

Author: lramos15

.github/workflows/on-label.yml

@@ -71,6 +71,7 @@ jobs:
         if: contains(github.event.issue.labels.*.name, 'testplan-item') || contains(github.event.issue.labels.*.name, 'invalid-testplan-item')
         uses: ./actions/test-plan-item-validator
         with:
+          token: ${{secrets.VSCODE_ISSUE_TRIAGE_BOT_PAT}}
           refLabel: on-testplan
           label: testplan-item
           invalidLabel: invalid-testplan-item

.github/workflows/on-open.yml

@@ -66,6 +66,7 @@ jobs:
       - name: Run Test Plan Item Validator
         uses: ./actions/test-plan-item-validator
         with:
+          token: ${{secrets.VSCODE_ISSUE_TRIAGE_BOT_PAT}}
           refLabel: on-testplan
           label: testplan-item
           invalidLabel: invalid-testplan-item

.github/workflows/test-plan-item-validator.yml

@@ -22,6 +22,7 @@ jobs:
         if: contains(github.event.issue.labels.*.name, 'testplan-item') || contains(github.event.issue.labels.*.name, 'invalid-testplan-item')
         uses: ./actions/test-plan-item-validator
         with:
+          token: ${{secrets.VSCODE_ISSUE_TRIAGE_BOT_PAT}}
           refLabel: on-testplan
           label: testplan-item
           invalidLabel: invalid-testplan-item