Move all PyTorch/XLA regression test on Trillium to one DAG page

[ManfeiBai]

Description

modify Mantaray&XLML to parse xlml tasks, merge all tests for PyTorch/XLA into one dag page

Tests

Checklist

Before submitting this PR, please make sure (put X in square brackets):

• I have performed a self-review of my code.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run one-shot tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed.

[RissyRan]

Please also add ownership into this file: https://github.com/GoogleCloudPlatform/ml-auto-solutions/blob/master/.github/CODEOWNERS. So your team could directly review them

[ManfeiBai]

https://github.com/GoogleCloudPlatform/ml-auto-solutions/blob/master/.github/CODEOWNERS

Thanks, created PR for add CODEOWNERS: #509