fix: include fp8_blockscale_gemm_90 in AOT jit-cache (#2533)

## Summary
- Add fp8_blockscale_gemm_90 (gen_fp8_blockscale_gemm_sm90_module) to
the AOT build list when SM90 is enabled.
- Avoid runtime JIT compilation for fp8_blockscale_gemm_sm90 in
environments without CUDA dev headers, which can fail with cublasLt.h
not found.

## Changes
- flashinfer/aot.py: append gen_fp8_blockscale_gemm_sm90_module() under
add_moe + has_sm90 gating.

## Related Issues
- Fixes #2527
- #2527

## Tests

<!-- .github/pull_request_template.md -->

## 📌 Description

<!-- What does this PR do? Briefly describe the changes and why they’re
needed. -->

## 🔍 Related Issues

<!-- Link any related issues here -->

## 🚀 Pull Request Checklist

Thank you for contributing to FlashInfer! Before we review your pull
request, please make sure the following items are complete.

### ✅ Pre-commit Checks

- [x] I have installed `pre-commit` by running `pip install pre-commit`
(or used your preferred method).
- [x] I have installed the hooks with `pre-commit install`.
- [x] I have run the hooks manually with `pre-commit run --all-files`
and fixed any reported issues.

> If you are unsure about how to set up `pre-commit`, see [the
pre-commit documentation](https://pre-commit.com/).

## 🧪 Tests

- [x] Tests have been added or updated as needed.
- [] All tests are passing (`unittest`, etc.).

## Reviewer Notes

<!-- Optional: anything you'd like reviewers to focus on, concerns, etc.
-->


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **New Features**
* Added support for FP8 blockscale matrix multiplication operations on
SM90 GPU architecture.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: Edward-lyz

flashinfer/aot.py

@@ -52,6 +52,7 @@
 from .jit.gemm import (
     gen_gemm_module,
     gen_gemm_sm90_module,
+    gen_fp8_blockscale_gemm_sm90_module,
     gen_gemm_sm100_module,
     gen_gemm_sm100_module_cutlass_fp4,
     gen_gemm_sm100_module_cutlass_fp8,
@@ -477,6 +478,8 @@ def gen_all_modules(
         jit_specs.append(gen_gemm_module())
         if has_sm90:
             jit_specs.append(gen_gemm_sm90_module())
+            # fp8 blockscale GEMM (SM90)
+            jit_specs.append(gen_fp8_blockscale_gemm_sm90_module())
             jit_specs.append(gen_fp4_quantization_sm90_module())
             jit_specs.append(gen_cutlass_fused_moe_sm90_module())
         if has_sm100: