Move the latest release tests from T4 to L40S

[albertvillanova]

This PR runs the daily latest-release tests on the same GPU runner as the rest of the GPU CI.

Motivation

tests_latest.yml stayed on aws-g4dn-2xlarge (T4) when the other GPU workflows moved to aws-g6e-4xlarge (L40S) in #6741: the release branch in use at the time (v1.10-release) predated the flash-attn2 xfail markers and would have failed on Ada hardware. It is now the only GPU workflow left on T4.

Both halves of that reason are gone. The workflow runs against v1.13-release, and the xfail markers were removed in #7057 once the padding-free tests passed.

Solution

On T4, is_ampere_or_newer() skips the two padding-free tests, so the move makes them run: tests/test_dpo_trainer.py::TestDPOTrainer::test_train_padding_free and tests/test_sft_trainer.py::TestSFTTrainer::test_train_padding_free. Both are identical on v1.13-release and main, and both pass on L40S in the Tests with dev dependencies job of tests.yml, which uses the same container, runner and dependency set as this workflow.

The other tests gated on is_ampere_or_newer() are unaffected: the GRPO continuous batching test is marked slow, and the experimental ones are excluded from collection by norecursedirs.

Changes

• Run the job on aws-g6e-4xlarge instead of aws-g4dn-2xlarge
• Remove the obsolete TODO about the runner

---

Note

Low Risk
CI-only runner change with no application code touched; expanded test execution matches the existing dev-dependencies GPU job that already passes on the same hardware.

Overview
Aligns the daily Tests latest TRL release with dev dependencies workflow with the rest of GPU CI by switching the runner from aws-g4dn-2xlarge (T4) to aws-g6e-4xlarge (L40S) and dropping the outdated TODO that blocked the move.

On L40S, is_ampere_or_newer() is true, so the job will execute the padding-free DPO and SFT trainer tests that were previously skipped on T4; other Ampere-gated tests stay unchanged (slow GRPO batching, experimental paths excluded from collection).

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[bot-ci-comment]

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