Update all Github migration tests to use a new repo created just for
these tests that won't accidentially be modified by regular users
interacting with issues.
Fixes#8895
* Update Github migration test
Earlier today #716 was reopened which updated the modification time for
an old milestone (1.6.0) that we use in testing with the assumption that
it is old and won't change. This breaks all builds now, so remove this
test since we have others that test the same code and this milestone
will likely be updated again as that issue changes etc...
* ci
* Store original author info for migrated issues and comments
Keep original author name for displaying in Gitea interface and also
store original author user ID for potential future use in linking
accounts from old location.
* Add original_url for repo
Store the original URL for a migrated repo
Clean up migrations/tests
* fix migration
* fix golangci-lint
* make 'make revive' happy also
* Modify templates to use OriginalAuthor if set
Use the original author name in templates if it is set rather than the
user who migrated/currently owns the issues
* formatting fixes
* make generate-swagger
* Use default avatar for imported comments
* Remove no longer used IgnoreIssueAuthor option
* Add OriginalAuthorID to swagger also
