Add test config for coqui/XTTS-v2 model

[ashokkumarkannan1]

Ticket

• [Model Bringup] coqui/XTTS-v2 #5216 (Model Bringup: coqui/XTTS-v2)
• torch.compile (tt backend) functionalization fails on prims::view_of from no-op squeeze(dim) #5375 (functionalization bug surfaced by this model)

Problem description

• XTTS-v2 needs a runner test_config entry and tt-xla-side coverage. Bringing it up surfaced a model-independent functionalization bug: the HiFiGAN decoder's no-op .squeeze(1) lowers to prims::view_of, which the tt functionalization pass cannot handle, so the model fails FE compilation.

What's changed

• Bumps tt_forge_models to the XTTS-v2 ModelLoader (Bringup XTTS-v2 (coqui/XTTS-v2) text-to-speech model tt-forge-models#784).
• Adds the runner test_config entry xtts_v2/pytorch-XTTS_v2-single_device-inference, marked KNOWN_FAILURE_XFAIL / FAILED_FE_COMPILATION with a link to torch.compile (tt backend) functionalization fails on prims::view_of from no-op squeeze(dim) #5375.
• Adds tests/torch/models/xtts_v2/ CPU equivalence test asserting the custom forward matches native Xtts.inference at PCC 1.0 (isolates the issue to the compiler, not the bringup logic).
• This branch intentionally omits the decoder workaround so the failure stays visible; once Decompose prims.view_of to fix functionalization of no-op views (#5375) #5388 lands, the model compiles end-to-end on TT (PCC 0.82) and the entry can move to EXPECTED_PASSING (assert_pcc:false).

Results

Check	Result
CPU equivalence test (custom forward vs native inference)	PCC 1.0
Runner test on current stack (no workaround)	xfail — FE compilation prims::view_of (#5375)
With #5388 fix	compiles & runs on TT, PCC 0.82 vs CPU

Checklist

• New/Existing tests provide coverage for changes

Logs

• xtts_v2.log — compiles & runs, PCC 0.3466

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.85%. Comparing base (f4c45f5) to head (3603d3c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5376      +/-   ##
==========================================
+ Coverage   33.81%   33.85%   +0.04%     
==========================================
  Files          37       37              
  Lines        4992     4992              
==========================================
+ Hits         1688     1690       +2     
+ Misses       3304     3302       -2     

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