fix: a few bugs in release/2.12

[zewenli98]

Description

1. IAttentionLayer requires strongly typed network. The main branch removed use_explicit_typing but the release/2.12 still has it and use_explicit_typing is False by default.
2. Skip flash_attention tests on Windows.
3. Remove the pytorch limitation because I found the dev versions of pytorch 2.12.0 have that limitation but the release version doesn't.
4. Both L0 dynamo core tests and L1 dynamo core tests on standard TRT Linux runs hlo/ tests on CI workflow, so I removed the duplicate from L0.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[narendasan]

LGTM