Issues overview should not show issues from archived repos (#13220)

* Add lots of comments to user.Issues()

* Answered some questions from comments

* fix typo in comment

* Refac user.Issues(): add func repoIDs

* Refac user.Issues(): add func userRepoIDs

* Refac user.Issues(): add func issueIDsFromSearch

* Refac user.Issues(): improve error handling

* Refac user.Issues(): add inline documentation and move variable declarations closer to their usages

* Refac user.Issues(): add func repoIDMap

* Refac user.Issues(): cleanup

* Refac: Separate Issues from Pulls during routing

* fix typo in comment

* Adapt Unittests to Refactoring

* Issue13171: Issue and PR Overviews now ignore archived Repositories

* changed some verbatim SQL conditions to builder.Eq

* models/issue.go: use OptionalBool properly

Co-authored-by: 6543 <6543@obermui.de>

* Use IsArchived rather than ExcludeArchivedRepos

* fixed broken test after merge

* added nil check

* Added Unit Test securing Issue 13171 fix

* Improved IsArchived filtering in issue.GetUserIssueStats

* Removed unused func

* Added grouping to avoid returning duplicate repo IDs

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Gitea <gitea@fake.local>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

models/fixtures/repository.yml

@@ -4,6 +4,7 @@
   owner_name: user2
   lower_name: repo1
   name: repo1
+  is_archived: false
   is_empty: false
   is_private: false
   num_issues: 2
@@ -23,6 +24,7 @@
   owner_name: user2
   lower_name: repo2
   name: repo2
+  is_archived: false
   is_private: true
   num_issues: 2
   num_closed_issues: 1
@@ -693,3 +695,43 @@
   num_issues: 0
   is_mirror: false
   status: 0
+
+-
+  id: 50
+  owner_id: 30
+  owner_name: user30
+  lower_name: repo50
+  name: repo50
+  is_archived: false
+  is_empty: false
+  is_private: false
+  num_issues: 1
+  num_closed_issues: 0
+  num_pulls: 0
+  num_closed_pulls: 0
+  num_milestones: 0
+  num_closed_milestones: 0
+  num_watches: 0
+  num_projects: 0
+  num_closed_projects: 0
+  status: 0
+
+-
+  id: 51
+  owner_id: 30
+  owner_name: user30
+  lower_name: repo51
+  name: repo51
+  is_archived: true
+  is_empty: false
+  is_private: false
+  num_issues: 1
+  num_closed_issues: 0
+  num_pulls: 0
+  num_closed_pulls: 0
+  num_milestones: 0
+  num_closed_milestones: 0
+  num_watches: 0
+  num_projects: 0
+  num_closed_projects: 0
+  status: 0