[feature](file-cache) Separate file cache control for OLAP tables and external catalogs

[wenzhenghu]

… external catalogs

What problem does this PR solve?

Issue Number: close #xxx

Related PR: #xxx

Problem Summary:

Release note

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Check List (For Author)

• Test

  • Regression test
  • Unit Test
  • Manual test (add detailed scripts or steps below)
  • No need to test or manual test. Explain why:
    • This is a refactor/code format and no logic has been changed.
    • Previous test can cover this change.
    • No code files have been changed.
    • Other reason

• Behavior changed:

  • No.
  • Yes.

• Does this need documentation?

  • No.
  • Yes.

Check List (For Reviewer who merge this PR)

• Confirm the release note
• Confirm test cases
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• Add branch pick label

[hello-stephen]

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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.
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[dataroaring]

When cache is enable, it is disposable? Originally, it is disposable when cache is disable?

[dataroaring]

Code review

Found 2 issues:

1. Inverted is_disposable logic in beta_rowset_reader.cpp -- Missing ! negation. The old code was is_disposable = disable_file_cache, so when cache is disabled, data is disposable (correct). The new code is is_disposable = enable_file_cache_olap_tables, which marks data as disposable when cache is enabled (wrong). Should be !enable_file_cache_olap_tables, consistent with how file_scanner.cpp handles the same pattern.

doris/be/src/olap/rowset/beta_rowset_reader.cpp

Lines 222 to 225 in 793f192

	_read_options.io_ctx.query_id = &_read_context->runtime_state->query_id();
	_read_options.io_ctx.is_disposable =
	_read_context->runtime_state->query_options().enable_file_cache_olap_tables;
	}

2. Wrong variable used in file_scanner.cpp -- FileScanner is used for external catalog scans (Hive, S3, etc.), but line 172 uses enable_file_cache_olap_tables instead of enable_file_cache_external_catalogs. Line 1815 in the same file correctly uses enable_file_cache_external_catalogs, confirming the variable at line 172 should match. This defeats the purpose of separating OLAP vs external catalog cache control.

doris/be/src/vec/exec/scan/file_scanner.cpp

Lines 171 to 173 in 793f192

	_io_ctx->file_reader_stats = _file_reader_stats.get();
	_io_ctx->is_disposable = !_state->query_options().enable_file_cache_olap_tables;

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