Change name field type in CodeBlock to JsString

[HalidOdat]

Related #2626

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	94,842	94,842	0
Passed	74,691	74,691	0
Ignored	18,812	18,812	0
Failed	1,339	1,339	0
Panics	0	0	0
Conformance	78.75%	78.75%	0.00%

[codecov]

Codecov Report

Merging #3107 (883b376) into main (9b1f2f4) will increase coverage by 0.25%.
The diff coverage is 29.16%.

@@            Coverage Diff             @@
##             main    #3107      +/-   ##
==========================================
+ Coverage   50.42%   50.67%   +0.25%     
==========================================
  Files         444      444              
  Lines       45877    42615    -3262     
==========================================
- Hits        23132    21594    -1538     
+ Misses      22745    21021    -1724     

Impacted Files	Coverage Δ
boa_engine/src/vm/flowgraph/mod.rs	0.00% <0.00%> (ø)
boa_runtime/src/console/mod.rs	37.18% <0.00%> (-0.94%)	⬇️
boa_engine/src/vm/code_block.rs	59.62% <25.00%> (-1.39%)	⬇️
boa_engine/src/bytecompiler/mod.rs	67.59% <100.00%> (+0.04%)	⬆️

... and 185 files with indirect coverage changes