[Merged by Bors] - Indicate bigint has constructor

[lupd]

This Pull Request changes BigInt so that isConstructor returns true.

It changes a single boolean value for BigInt's ConstructorBuilder.

[codecov]

Codecov Report

Merging #2008 (4112841) into main (ffc7a3e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2008   +/-   ##
=======================================
  Coverage   45.89%   45.89%           
=======================================
  Files         206      206           
  Lines       17150    17150           
=======================================
  Hits         7871     7871           
  Misses       9279     9279           

Impacted Files	Coverage Δ
boa_engine/src/builtins/bigint/mod.rs	79.16% <ø> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ffc7a3e...4112841. Read the comment docs.

[HalidOdat]

VM implementation

Test result	main count	PR count	difference
Total	88,650	88,650	0
Passed	44,003	44,005	+2
Ignored	21,711	21,711	0
Failed	22,936	22,934	-2
Panics	0	0	0
Conformance	49.64%	49.64%	+0.00%

Fixed tests (2):

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

[raskad]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded:

• Clippy
• Documentation
• Examples
• Rustfmt
• Tests on Linux
• Tests on MacOS
• Tests on Windows