[Pallas TPU] Consolidate OpsExtraTest into OpsTest

Historically, tests that only ran on GPUs were placed in `OpsExtraTest`, while general tests were in `OpsTest`. However, this separation may cause us to miss issues that should be addressed on TPUs as well. Going forward, all tests will be unified in `OpsTest`, and any tests that fail on TPUs will be skipped individually using `skipTest`. This will help us better track and address TPU-specific failures.

PiperOrigin-RevId: 679493740