[fix](regression) Mirror HTTP TVF fixtures in regression OSS

[hello-stephen]

What

Replace the mutable/public HuggingFace URLs in external_table_p0/tvf/test_http_tvf with stable public mirrors in the Doris regression OSS bucket.

Why

The branch-4.1 S3 P2 validation reached the HuggingFace section and failed with java.net.SocketTimeoutException: Connect timed out. The test data should not depend on HuggingFace network availability or mutable dataset branches.

The prompts fixture is pinned to source revision 61229c8c07ea12c6e219b2b2b728f23f2842901b, which preserves the expected 204 records. The IMDb JSON and Parquet fixtures are mirrored byte-for-byte. Existing golden output is unchanged.

Jira: DORIS-27400

Validation

• git diff --check
• Groovy 4.0.19 compilation
• Suite load/discovery: test_http_tvf, tag p2
• Public OSS GET and byte-range GET for all four fixtures
• Local/remote MD5 matches for all fixtures
• Prompts CSV logical record count: 204

This is a P2 case-only change; after merge it still requires an exact post-merge rerun of external_table_p0/tvf/test_http_tvf.

[hello-stephen]

Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[hello-stephen]

[doris-27400-static-gate]

This is a P2 case-only fix. It does not touch the regression framework, shared utilities, dependencies, or build paths.

Validated before requesting the CI skip:

• git diff --check
• Groovy 4.0.19 compilation
• suite load/discovery: test_http_tvf, tag p2
• all four mirrored objects are publicly readable and support byte-range GET (206)
• local/remote MD5 matches for every fixture
• pinned prompts snapshot contains exactly the expected 204 logical records
• existing golden output is unchanged

Community buildall does not execute this P2 case. The required proof remains an exact post-merge branch-4.1 rerun of external_table_p0/tvf/test_http_tvf.

[hello-stephen]

skip buildall

[hello-stephen]

/review

[github-actions]

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