fix: improve skip disabled feature

[deandreamatias]

Connection with issue(s)

Close #957

Solution description

Now when skip disabled is set to true, do not show the error on field decoration

To Do

• Read contributing guide
• Check the original issue to confirm it is fully satisfied
• Add solution description to help guide reviewers
• Add unit test to verify new or fixed behaviour
• If apply, add documentation to code properties and package readme

[codecov]

Codecov Report

Merging #1225 (368fb8d) into main (c88535d) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1225      +/-   ##
==========================================
+ Coverage   83.66%   83.87%   +0.20%     
==========================================
  Files          19       19              
  Lines         710      713       +3     
==========================================
+ Hits          594      598       +4     
+ Misses        116      115       -1     

Impacted Files	Coverage Δ
lib/src/form_builder.dart	70.93% <ø> (+1.16%)	⬆️
lib/src/form_builder_field.dart	79.76% <100.00%> (+0.74%)	⬆️

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