[Merged by Bors] - Fix value to bigint conversion

[HalidOdat]

This PR should fix the remaining tests in the builtin BigInt test suite

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	94,277	94,277	0
Passed	71,998	72,000	+2
Ignored	17,324	17,324	0
Failed	4,955	4,953	-2
Panics	14	14	0
Conformance	76.37%	76.37%	+0.00%

Fixed tests (2):

test/built-ins/BigInt/constructor-coercion.js [strict mode] (previously Failed)
test/built-ins/BigInt/constructor-coercion.js (previously Failed)

[codecov]

Codecov Report

Merging #2688 (fb9ceac) into main (50a343a) will increase coverage by 0.06%.
The diff coverage is 100.00%.

❗ Current head fb9ceac differs from pull request most recent head 58f8934. Consider uploading reports for the commit 58f8934 to get more accurate results

@@            Coverage Diff             @@
##             main    #2688      +/-   ##
==========================================
+ Coverage   49.33%   49.39%   +0.06%     
==========================================
  Files         397      395       -2     
  Lines       39610    39572      -38     
==========================================
+ Hits        19540    19548       +8     
+ Misses      20070    20024      -46     

Impacted Files	Coverage Δ
boa_engine/src/builtins/bigint/mod.rs	85.18% <100.00%> (ø)

... and 10 files with indirect coverage changes

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[Razican]

Thanks!

[nekevss]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded:

• Build and Test (macos-latest)
• Build and Test (windows-latest)
• Coverage
• Misc