Remove the result declaration kind

[turbolent]

Description

The result declaration kind is not needed anymore after #905

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• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Merging #1001 (f300271) into master (3141dd5) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1001      +/-   ##
==========================================
- Coverage   75.55%   75.54%   -0.01%     
==========================================
  Files         267      267              
  Lines       32852    32848       -4     
==========================================
- Hits        24820    24816       -4     
  Misses       6905     6905              
  Partials     1127     1127              

Flag	Coverage Δ
unittests	75.54% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
runtime/common/declarationkind.go	75.96% <ø> (+0.96%)	⬆️
runtime/common/declarationkind_string.go	33.33% <ø> (ø)
runtime/sema/checker.go	90.00% <ø> (-0.01%)	⬇️
runtime/sema/check_function.go	99.54% <100.00%> (ø)
runtime/ast/transaction_declaration.go	57.89% <0.00%> (-6.82%)	⬇️
runtime/interpreter/decode.go	48.64% <0.00%> (-0.10%)	⬇️
runtime/interpreter/value.go	77.44% <0.00%> (+<0.01%)	⬆️

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