* MM-54489 restrict mobile oauth/saml redirect to native app schemes
* replace slices package with contains function in utils
* use the existing Contains utility function
* Fix unit tests
* more test cases
* fix cfg.NativeAppSettings.AppCustomURLSchemes assignment
* Append mmauth to cfg.NativeAppSettings.AppCustomURLSchemes in unit test
* add teams to allowed frame-ancestors
* fix unit tests
* set SameSite attribute for session cookie
* further restrict ancestors
* skip landing page if in iframe
* Only set cookie SameSite=None if embedded in iframe
* don't set MMEMBED cookie on landing page (check only)
* fully parse MMEMBED cookie
* add comment
* more comments
---------
Co-authored-by: Mattermost Build <build@mattermost.com>
It was a good decision in hindsight to keep the public module as 0.x
because this would have been a breaking change again.
https://mattermost.atlassian.net/browse/MM-53032
```release-note
Changed the Go module path from github.com/mattermost/mattermost-server/server/v8 to github.com/mattermost/mattermost/server/v8.
For the public facing module, it's path is also changed from github.com/mattermost/mattermost-server/server/public to github.com/mattermost/mattermost/server/public
```
https://mattermost.atlassian.net/browse/MM-52079
```release-note
We upgrade the module version to 8.0. The new module path is github.com/mattermost-server/server/v8.
```
Co-authored-by: Doug Lauder <wiggin77@warpmail.net>
