enh(issue-search): support filtering by project in user/org listing (#12596)

Support filtering `/issue` & `/pulls` (and corresponding org paths) by a project ID.

Closes #12559

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12596
Reviewed-by: Gusted <gusted@noreply.codeberg.org>

models/fixtures/project.yml

@@ -78,6 +78,6 @@
   is_closed: false
   creator_id: 2
   board_type: 1
-  type: 1
+  type: 3
   created_unix: 1688973000
   updated_unix: 1688973000

models/fixtures/project_board.yml

@@ -84,3 +84,13 @@
   sorting: 1
   created_unix: 1588117528
   updated_unix: 1588117528
+
+-
+  id: 10
+  project_id: 7
+  title: Default
+  creator_id: 2
+  default: true
+  sorting: 1
+  created_unix: 1588117528
+  updated_unix: 1588117528

models/fixtures/project_issue.yml

@@ -25,3 +25,24 @@
   project_id: 1
   project_board_id: 3
   sorting: 0
+
+-
+  id: 5
+  issue_id: 16
+  project_id: 4
+  project_board_id: 4
+  sorting: 0
+
+-
+  id: 6
+  issue_id: 15
+  project_id: 7
+  project_board_id: 10
+  sorting: 0
+
+-
+  id: 7
+  issue_id: 17
+  project_id: 7
+  project_board_id: 10
+  sorting: 1