[AMD CI] re-enable testcases missed when migrating attention backend tests

[bingxche]

Motivation

PR #15563 missed some testcases used in amd ci, this pr is to re-enable them.

Modifications

File	AMD CI Registration
test_create_kvindices.py	✅ enabled, est_time=10
test_radix_attention.py	✅ enabled, est_time=100
test_torch_native_attention_backend.py	✅ enabled, est_time=150
test_triton_attention_backend.py	✅ enabled, est_time=200
test_triton_attention_kernels.py	⚠️ disabled, est_time=30
test_triton_sliding_window.py	✅ enabled, est_time=100

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review Process

1. Ping Merge Oncalls to start the PR flow. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments (/tag-run-ci-label, /rerun-failed-ci, /tag-and-rerun-ci) or contact authorized users to do so.
4. After green CI and required approvals, ask Merge Oncalls to merge.

[gemini-code-assist]

Summary of Changes

Hello @bingxche, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses the re-enablement of several attention backend test cases for AMD's Continuous Integration (CI) system. These tests were inadvertently missed during a previous migration. By registering these tests with the AMD CI, the change aims to expand test coverage and ensure the stability and correctness of attention mechanisms on AMD platforms.

Highlights

• AMD CI Test Re-enablement: Re-enabled AMD CI for five attention backend test cases: test_create_kvindices.py, test_radix_attention.py, test_torch_native_attention_backend.py, test_triton_attention_backend.py, and test_triton_sliding_window.py.
• Disabled AMD CI Test: Explicitly disabled AMD CI for test_triton_attention_kernels.py during this re-enablement phase.
• CI Registration Update: Updated the CI registration logic in affected test files to include register_amd_ci alongside register_cuda_ci.

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[gemini-code-assist]

Code Review

This pull request re-enables several test cases for AMD CI by adding register_amd_ci calls to the respective test files. The changes are consistent with the goals outlined in the description and the summary table. I have one minor suggestion to improve the clarity of a disabled test case for better long-term maintainability.

[gemini-code-assist]

For better clarity and maintainability, it would be helpful to provide a more descriptive reason for disabling this test on AMD CI. A single space is not very informative for future developers who might wonder why this test is disabled. Providing a clear reason, for example "Triton kernels not yet supported on AMD", improves code readability.

Suggested change

	register_amd_ci(est_time=30, suite="stage-b-test-small-1-gpu", disabled=" ")
	register_amd_ci(est_time=30, suite="stage-b-test-small-1-gpu", disabled="Triton kernels not yet supported on AMD")