chore(actions): add icon leads notification for calcite-ui-icons requ…

…ests (#11263)

**Related Issue:** #9922

## Summary
Add automation to issues when the `calcite-ui-icons` label is added,
where Icon team leads will receive an `@` notification via a comment,
similar to the [new component label
automation](#10382 (comment))
from the [notifyAboutNewComponent
script](https://github.com/Esri/calcite-design-system/blob/dev/.github/scripts/notifyAboutNewComponent.js).

cc @allieorth, @arowles

.github/scripts/notifyAboutIconRequest.js

@@ -0,0 +1,33 @@
+// @ts-check
+
+// If the "calcite-ui-icons" label is added to an issue, generates a notification to the Icons team leads to review
+// The secret is formatted like so: icon-team-member-1, icon-team-member-2, icon-team-member-3
+// Note the script automatically adds the "@" character in to notify the icon team lead(s)
+
+/** @param {import('github-script').AsyncFunctionArguments} AsyncFunctionArguments */
+module.exports = async ({ github, context }) => {
+  const { repo, owner } = context.repo;
+
+  const payload = /** @type {import('@octokit/webhooks-types').IssuesLabeledEvent} */ (context.payload);
+  const {
+    issue: { number },
+  } = payload;
+
+  const { ICONS_TEAM } = process.env;
+
+  // Add a "@" character to notify the user
+  const icon_leads = ICONS_TEAM?.split(",").map((v) => " @" + v.trim());
+
+  if (!icon_leads?.length) {
+    console.error("unable to determine icon leads");
+    process.exit(1);
+  }
+
+  // Add a comment to issues with the 'calcite-ui-icons' label to notify icon team lead(s)
+  await github.rest.issues.createComment({
+    owner,
+    repo,
+    issue_number: number,
+    body: `cc ${icon_leads}`,
+  });
+};

.github/workflows/issue-notifications.yaml → .github/workflows/issue-notifications.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name : "Assign for verification"
+      - name: "Assign for verification"
         if: github.event.label.name == '3 - installed'
         uses: actions/github-script@v7
         env:
@@ -51,3 +51,12 @@ jobs:
             const action = require('${{ github.workspace }}/.github/scripts/notifyAboutNewComponent.js')
             await action({github, context, core})
 
+      - name: "Icon request notification"
+        if: github.event.label.name == 'calcite-ui-icons'
+        uses: actions/github-script@v7
+        env:
+          ICONS_TEAM: ${{secrets.ICON_LEADS}}
+        with:
+          script: |
+            const action = require('${{ github.workspace }}/.github/scripts/notifyAboutIconRequest.js')
+            await action({github, context, core})