Fix broken unit tests and timeout for deeplabv3 (#425)

Summary:
Some fixes to make trunk green again:

* https://github.com/pytorch/executorch/pull/349 rename a test. This is the quick mitigation, we will need a better test discovery mechanism here
* Increase the timeout from 60m to 90m for deeplabv3.  Again, this is also a quick fix.  As this model will be the long pole on OSS CI.  There are more powerful runner to use if that helps.

Pull Request resolved: https://github.com/pytorch/executorch/pull/425

Reviewed By: dbort

Differential Revision: D49477725

Pulled By: huydhn

fbshipit-source-id: 0fb701cd13ffd1eea76f630d4a1f8eb204e4c63f