Move RefCell of CompileTimeEnvironments to field bindings

[HalidOdat]

All fields except the bindings field are not mutated after CompileTimeEnvironment creation. It moves the RefCell to bindings field, this cleans the methods callsites.

[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 #3108 (d9bd825) into main (9b1f2f4) will increase coverage by 0.24%.
The diff coverage is 89.55%.

@@            Coverage Diff             @@
##             main    #3108      +/-   ##
==========================================
+ Coverage   50.42%   50.66%   +0.24%     
==========================================
  Files         444      444              
  Lines       45877    42596    -3281     
==========================================
- Hits        23132    21580    -1552     
+ Misses      22745    21016    -1729     

Impacted Files	Coverage Δ
boa_engine/src/bytecompiler/function.rs	90.62% <ø> (ø)
...ine/src/environments/runtime/declarative/module.rs	0.00% <ø> (ø)
boa_engine/src/module/source.rs	0.00% <0.00%> (ø)
...ne/src/object/internal_methods/module_namespace.rs	0.00% <ø> (ø)
boa_engine/src/vm/code_block.rs	59.84% <ø> (-1.17%)	⬇️
boa_engine/src/bytecompiler/declarations.rs	51.52% <66.66%> (-3.80%)	⬇️
boa_engine/src/environments/runtime/mod.rs	80.86% <80.00%> (-0.21%)	⬇️
boa_engine/src/bytecompiler/env.rs	94.59% <88.88%> (+1.26%)	⬆️
boa_engine/src/environments/compile.rs	86.50% <94.73%> (+1.65%)	⬆️
boa_engine/src/bytecompiler/expression/assign.rs	38.00% <100.00%> (ø)
... and 4 more

... and 183 files with indirect coverage changes

[jedel1043]

Nice cleanup!

[Razican]

Looks great!