Avoid double utf8 checks on MutableUtf8 -> Utf8

[jorgecarleitao]

No description provided.

[codecov]

Codecov Report

Merging #655 (6e7c5cf) into main (23c7d8a) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #655      +/-   ##
==========================================
- Coverage   69.92%   69.91%   -0.02%     
==========================================
  Files         299      299              
  Lines       16647    16684      +37     
==========================================
+ Hits        11640    11664      +24     
- Misses       5007     5020      +13     

Impacted Files	Coverage Δ
src/array/utf8/mutable.rs	85.49% <50.00%> (-0.29%)	⬇️
src/compute/arithmetics/time.rs	42.30% <0.00%> (-1.93%)	⬇️
src/scalar/boolean.rs	85.71% <0.00%> (-0.96%)	⬇️
src/compute/comparison/mod.rs	23.07% <0.00%> (ø)
src/bitmap/immutable.rs	86.58% <0.00%> (+0.09%)	⬆️
src/io/parquet/read/nested_utils.rs	78.43% <0.00%> (+0.98%)	⬆️
src/scalar/primitive.rs	85.71% <0.00%> (+4.23%)	⬆️

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[ritchie46]

Was it called often? 😁