chore: check license headers in SQL logic tests

[Xuanwo]

Which issue does this PR close?

No linked issue; follows up on missing license headers found during release review.

Rationale for this change

Several SQL logic test files lack ASF license headers, and the existing license check only selects Rust, Python, and TypeScript files. Include SQL logic tests in that check to catch missing headers in future changes.

What changes are included in this PR?

• Add ASF headers to 18 SQL logic test files, including sort_pushdown.slt, datetime/arith_timestamp_duration.slt, datetime/arith_time_interval.slt, and parquet_cdc_config.slt.
• Select all *.slt files and map the extension to HawkEye's script comment style.
• Normalize 406 existing headers and their spacing to the canonical format required by HawkEye 7.0.0. SQL statements and expected results are unchanged.

What is the testing strategy for this PR?

• The existing license check covers all 517 SQL logic test files and passes with no unsupported files.
• Temporarily removing a header from both a top-level and a nested SQL logic test makes the CI license check fail; restoring the headers makes it pass.
• Compare all modified SQL logic test bodies against the base commit, excluding leading blank lines: unchanged.
• Full extended workspace test command passes (11,605 Rust tests passed, 8 ignored, plus the SQL logic test runner).
• cargo fmt --all, cargo clippy --all-targets --all-features -- -D warnings, and ./dev/rust_lint.sh.

Are there any user-facing changes?

No. This changes license headers and CI coverage only.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.91%. Comparing base (7e5f40a) to head (231d066).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25182      +/-   ##
==========================================
- Coverage   81.91%   81.91%   -0.01%     
==========================================
  Files        1132     1132              
  Lines      421117   421117              
  Branches   421117   421117              
==========================================
- Hits       344961   344957       -4     
- Misses      55767    55770       +3     
- Partials    20389    20390       +1     

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[kumarUjjawal]

Thank you @Xuanwo

This is nice.

[alamb]

Thank you @Xuanwo and @kumarUjjawal