* [MM-66718] Remove unneeded HTML templates watcher
The templates package currently supports filesystem watching to
automatically reload templates when files change. This feature is
unnecessary in production and adds complexity.
Changes:
- Removed NewWithWatcher() function from templates package
- Removed Close() method from Container
- Removed watch-related fields (watch, stop, stopped) from Container
- Removed fsnotify dependency usage
- Updated server.go to use New() instead of NewWithWatcher()
- Updated email/helper_test.go to use New()
- Removed watcher-related tests from templates_test.go
Template updates now require a server restart, which provides clearer
behavior and reduces code complexity.
* Remove unused fsnotify dependency
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>
