Gitea 2 Gitea migration (#12657)

* first draft

* update gitea sdk to 9e280adb4da

* adapt feat of updated sdk

* releases now works

* break the Reactions loop

* use convertGiteaLabel

* fix endless loop because paggination is not supported there !!!

* rename gitea local uploader files

* pagination can bite you in the ass

* Version Checks

* lint

* docs

* rename gitea sdk import to miss future conficts

* go-swagger: dont scan the sdk structs

* make sure gitea can shutdown gracefully

* make GetPullRequests and GetIssues similar

* rm useles

* Add Test: started ...

* ... add tests ...

* Add tests and Fixing things

* Workaround missing SHA

* Adapt: Ensure that all migration requests are cancellable
(714ab71ddc)

* LINT: fix misspells in test set

* adapt ListMergeRequestAwardEmoji

* update sdk

* Return error when creating giteadownloader failed

* update sdk

* adapt new sdk

* adopt new features

* check version before err

* adapt: 'migrate service type switch page'

* optimize

* Fix DefaultBranch

* impruve

* handle subPath

* fix test

* Fix ReviewCommentPosition

* test GetReviews

* add DefaultBranch int test set

* rm unused

* Update SDK to v0.13.0

* addopt sdk changes

* found better link

* format template

* Update Docs

* Update Gitea SDK (v0.13.1)

vendor/modules.txt

@@ -4,6 +4,9 @@ cloud.google.com/go/compute/metadata
 ## explicit
 code.gitea.io/gitea-vet
 code.gitea.io/gitea-vet/checks
+# code.gitea.io/sdk/gitea v0.13.1
+## explicit
+code.gitea.io/sdk/gitea
 # gitea.com/lunny/levelqueue v0.3.0
 ## explicit
 gitea.com/lunny/levelqueue
@@ -423,7 +426,7 @@ github.com/hashicorp/go-cleanhttp
 # github.com/hashicorp/go-retryablehttp v0.6.7
 ## explicit
 github.com/hashicorp/go-retryablehttp
-# github.com/hashicorp/go-version v0.0.0-00010101000000-000000000000 => github.com/6543/go-version v1.2.3
+# github.com/hashicorp/go-version v1.2.1 => github.com/6543/go-version v1.2.3
 ## explicit
 github.com/hashicorp/go-version
 # github.com/hashicorp/hcl v1.0.0