chore: run validation when debug assertion enabled and not only for test (#9073)

# Which issue does this PR close?

N/A

# Rationale for this change

More coverage, I might not be compiling for tests and still want this
validation

# What changes are included in this PR?

replace test with debug assertion

# Are these changes tested?

No

# Are there any user-facing changes?

not API change

Author: rluvaton

arrow-row/src/lib.rs

@@ -892,7 +892,7 @@ impl RowConverter {
         // and therefore must be valid
         let result = unsafe { self.convert_raw(&mut rows, validate_utf8) }?;
 
-        if cfg!(test) {
+        if cfg!(debug_assertions) {
             for (i, row) in rows.iter().enumerate() {
                 if !row.is_empty() {
                     return Err(ArrowError::InvalidArgumentError(format!(