cleanup sgl-kernel kernels

[zhyncs]

Motivation

• rm rotary_embedding cc @ByronHsu
• add fused_add_rms_norm (support float32)
• CI setting (CI instability can also cause other UTs to stop, which isn't very reasonable)

Modifications

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling.