chore(ci): remove pull_request_target (#90)

Similar to googleapis/langchain-google-alloydb-pg-python#189

.github/workflows/lint.yml

@@ -19,12 +19,6 @@ on:
       - "*.md"
       - ".kokoro/**"
       - ".github/**"
-  pull_request_target:
-    types: [labeled]
-    paths-ignore:
-      - "*.md"
-      - ".kokoro/**"
-      - ".github/**"
 
 jobs:
   lint:
@@ -34,33 +28,10 @@ jobs:
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
       cancel-in-progress: true
-    # run job on proper workflow event triggers (skip job for pull_request event from forks and only run pull_request_target for "tests: run" label)
-    if: "${{ (github.event.action != 'labeled' && github.event.pull_request.head.repo.full_name == github.event.pull_request.base.repo.full_name) || github.event.label.name == 'tests: run' }}"
 
     steps:
-      - name: Remove PR label
-        if: "${{ github.event.action == 'labeled' && github.event.label.name == 'tests: run' }}"
-        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          script: |
-            try {
-              await github.rest.issues.removeLabel({
-                name: 'tests: run',
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                issue_number: context.payload.pull_request.number
-              });
-            } catch (e) {
-              console.log('Failed to remove label. Another job may have already removed it!');
-            }
-
       - name: Checkout Repository
         uses: actions/checkout@v3
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
-          repository: ${{ github.event.pull_request.head.repo.full_name }}
-          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Python
         uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0