Allow multiple projects per issue and pull requests (#36784)

Add ability to add and remove multiple projects per issue
and pull request.

Resolve #12974

---------

Signed-off-by: Icy Avocado <avocado@ovacoda.com>
Co-authored-by: Tyrone Yeh <siryeh@gmail.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: OpenCode (gpt-5.2-codex) <opencode@openai.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>

tests/e2e/events.test.ts

@@ -20,7 +20,7 @@ test.describe('events', () => {
     await expect(badge).toBeHidden();
 
     // Create issue as another user — this generates a notification delivered via server push
-    await apiCreateIssue(request, owner, repoName, {title: 'events notification test', headers: apiUserHeaders(commenter)});
+    await apiCreateIssue(request, {owner, repo: repoName, title: 'events notification test', headers: apiUserHeaders(commenter)});
 
     // Wait for the notification badge to appear via server event
     await expect(badge).toBeVisible({timeout: 15000 * timeoutFactor});
@@ -37,7 +37,7 @@ test.describe('events', () => {
       loginUser(page, name),
       (async () => {
         await apiCreateRepo(request, {name, headers});
-        await apiCreateIssue(request, name, name, {title: 'events stopwatch test', headers});
+        await apiCreateIssue(request, {owner: name, repo: name, title: 'events stopwatch test', headers});
         await apiStartStopwatch(request, name, name, 1, {headers});
       })(),
     ]);