Ensure we can triage non-templated issues (#46362)

Sometimes github issues are created without following the template, and
if they don't receive the `state:needs triage` label from a template,
it's easy for us to miss them. Well, not anymore, thanks to this new
github workflow.
As an extra measure, the label is also added on reopened issues. All of
this only applies only to actions carried out by people outside of the
staff team.

Release Notes:

- N/A

.github/workflows/catch_blank_issues.yml

@@ -0,0 +1,71 @@
+name: "Label new and reopened blank issues for triage"
+
+on:
+  issues:
+    types:
+      - opened
+      - reopened
+
+permissions:
+  contents: read
+
+jobs:
+  add-triage-label:
+    if: github.repository == 'zed-industries/zed'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - id: get-app-token
+        uses: actions/create-github-app-token@bef1eaf1c0ac2b148ee2a0a74c65fbe6db0631f1 # v2.1.4
+        with:
+          app-id: ${{ secrets.ZED_COMMUNITY_BOT_APP_ID }}
+          private-key: ${{ secrets.ZED_COMMUNITY_BOT_PRIVATE_KEY }}
+          owner: zed-industries
+
+      - id: check-staff
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          github-token: ${{ steps.get-app-token.outputs.token }}
+          script: |
+            try {
+              const response = await github.rest.teams.getMembershipForUserInOrg({
+                org: 'zed-industries',
+                team_slug: 'staff',
+                username: context.payload.sender.login
+              });
+              return response.data.state === 'active';
+            } catch (error) {
+              if (error.status === 404) {
+                return false;
+              }
+              throw error;
+            }
+
+      - if: steps.check-staff.outputs.result == 'true'
+        run: |
+          echo "::notice::Skipping issue #${{ github.event.issue.number }} - actor is staff member"
+
+      - if: steps.check-staff.outputs.result == 'false'
+        id: add-label
+        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
+        with:
+          github-token: ${{ steps.get-app-token.outputs.token }}
+          script: |
+            const issue = context.payload.issue;
+            const hasTriageLabel = issue.labels.some(
+              label => label.name === 'state:needs triage'
+            );
+
+            if (hasTriageLabel) {
+              console.log('Issue already has state:needs triage, skipping');
+              return;
+            }
+
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: issue.number,
+              labels: ['state:needs triage']
+            });
+
+            console.log(`Added state:needs triage to issue #${issue.number}`);