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/reactions.test.ts

@@ -7,7 +7,7 @@ test('toggle issue reactions', async ({page, request}) => {
   const owner = env.GITEA_TEST_E2E_USER;
   await apiCreateRepo(request, {name: repoName});
   await Promise.all([
-    apiCreateIssue(request, owner, repoName, {title: 'Reaction test'}),
+    apiCreateIssue(request, {owner, repo: repoName, title: 'Reaction test'}),
     login(page),
   ]);
   await page.goto(`/${owner}/${repoName}/issues/1`);