[Merged by Bors] - Refactor guards into a ContextCleanupGuard abstraction

[jedel1043]

Noticed we were using this pattern on a couple of places, so I abstracted it behind a ContextCleanupGuard struct.

Let me know if you remember another place where this pattern would apply.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	94,601	94,601	0
Passed	73,226	73,226	0
Ignored	17,540	17,540	0
Failed	3,835	3,835	0
Panics	0	0	0
Conformance	77.41%	77.41%	0.00%

[codecov]

Codecov Report

Merging #2890 (8568784) into main (dff815d) will increase coverage by 0.01%.
The diff coverage is 87.09%.

@@            Coverage Diff             @@
##             main    #2890      +/-   ##
==========================================
+ Coverage   51.23%   51.24%   +0.01%     
==========================================
  Files         427      427              
  Lines       42520    42528       +8     
==========================================
+ Hits        21786    21795       +9     
+ Misses      20734    20733       -1     

Impacted Files	Coverage Δ
boa_engine/src/builtins/eval/mod.rs	64.42% <50.00%> (+0.53%)	⬆️
boa_engine/src/context/mod.rs	48.13% <90.90%> (+2.31%)	⬆️
boa_engine/src/vm/code_block.rs	55.63% <100.00%> (+0.07%)	⬆️

[HalidOdat]

Nice refactor! Looks good to me! :)

[raskad]

Makes a lot of sense and makes eval code a lot safer to adjust.

[raskad]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded!

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