fix: report a negative array_resize size as a user error

[1fanwang]

Which issue does this PR close?

None; found by sweeping the scalar functions with edge-case arguments.

Rationale for this change

array_resize with a negative size raises an internal error, which tells the
caller they hit a DataFusion bug and asks them to open a report:

> SELECT array_resize(make_array(1,2,3), -1, 0);
Internal error: array_resize: failed to convert size to usize.
This issue was likely caused by a bug in DataFusion's code. Please help us to
resolve this by filing a bug report in our issue tracker: https://github.com/apache/datafusion/issues

The size is an argument to the query, so a negative value is the caller's input
rather than a broken internal invariant. Sending someone to the issue tracker
for their own argument is misleading, and it hides what was actually wrong.

The behaviour was already meant to be an error. array_resize.slt has expected
this call to fail since before this change, but with a bare query error, so
the internal error satisfied it and went unnoticed.

What changes are included in this PR?

Reject a negative size with an execution error naming the value, which matches
how the neighbouring maximum-size check already reports bad input:

> SELECT array_resize(make_array(1,2,3), -1, 0);
Execution error: array_resize: size must not be negative, got -1

Valid input is untouched: 0 still returns [], 5 still grows to
[1, 2, 3, 9, 9], and a NULL size still returns NULL.

Are these changes tested?

Yes. The slt file gains the negative case for both List and LargeList, plus
i64::MIN for the boundary, each pinned to the new message so a regression back
to an internal error fails the suite.

$ cargo test -p datafusion-sqllogictest --test sqllogictests -- array
Progress: 53/53 files completed (100%)

$ cargo test -p datafusion-functions-nested --lib resize
test result: ok. 4 passed; 0 failed

The pre-existing query error case for -5 still passes, so the contract that
a negative size fails is unchanged.

Are there any user-facing changes?

The error for a negative size changes from an internal error to an execution
error with a clear message. No valid call changes behaviour, and no API changes.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.91%. Comparing base (7e5f40a) to head (f25bf2e).

Files with missing lines	Patch %	Lines
datafusion/functions-nested/src/resize.rs	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #25179      +/-   ##
==========================================
- Coverage   81.91%   81.91%   -0.01%     
==========================================
  Files        1132     1132              
  Lines      421117   421119       +2     
  Branches   421117   421119       +2     
==========================================
- Hits       344961   344952       -9     
- Misses      55767    55775       +8     
- Partials    20389    20392       +3     

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