[5336870] AutoCast: Unblock LSTM from conversion

[galagam]

Blocking was added as a WAR for TensorRT bug 5336870, fixed in TensorRT 10.14

What does this PR do?

Type of change: Bug fix

Overview: Unblock LSTM from conversion to 16-bit in AutoCast. Blocking was added as a WAR for TensorRT bug 5336870 (TRT only supported FP32 LSTM). Bug was fixed in TensorRT 10.14 which is now released.

Usage

# Add a code snippet demonstrating how to use this

Testing

Before your PR is "Ready for review"

• Make sure you read and follow Contributor guidelines and your commits are signed.
• Is this change backward compatible?: Yes
• Did you write any new necessary tests?: No
• Did you add or update any necessary documentation?: No
• Did you update Changelog?: No

Additional Information

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.37%. Comparing base (7d0f7a9) to head (71085a1).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #544   +/-   ##
=======================================
  Coverage   74.37%   74.37%           
=======================================
  Files         182      182           
  Lines       18219    18219           
=======================================
  Hits        13550    13550           
  Misses       4669     4669           

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