Fix 2 bugs that stopped test262

[RageKnify]

This Pull Request fixes the failure of test262 in CI by adding a check in Array.prototype.map and correcting Array.prototype.reduceRight for length 1.

It changes the following:

• Array.prototype.map now throws a RangeError if the length of the received object is greater than 2^32 - 1, as per the spec.
• Array.prototype.reduceRight now works correctly for length 1.

[codecov]

Codecov Report

Merging #812 into master will increase coverage by 0.00%.
The diff coverage is 88.88%.

@@           Coverage Diff           @@
##           master     #812   +/-   ##
=======================================
  Coverage   59.67%   59.68%           
=======================================
  Files         157      157           
  Lines       10052    10054    +2     
=======================================
+ Hits         5999     6001    +2     
  Misses       4053     4053           

Impacted Files	Coverage Δ
boa/src/builtins/array/mod.rs	73.72% <88.88%> (+0.10%)	⬆️

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[RageKnify]

There are other problems, working on them.

[HalidOdat]

On master it's 18.27%, Just checked the conformance of this branch:

2020-10-07T22:05:54.4837388Z Results:
2020-10-07T22:05:54.4837789Z Total tests: 38976
2020-10-07T22:05:54.4838209Z Passed tests: 8232
2020-10-07T22:05:54.4838671Z Conformance: 21.12%

Its 21.12% 🎉 from 7121 to 8232, that is another 1111 more passing tests (compared to master)

[Razican]

Amazing, great work!