Fixed some extra regex panics

[Razican]

This Pull Request is related to #817.

It changes the following:

• Removes some panics from RegExp methods, but it's probably not 100% spec compliant.

[github-actions]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,493	78,493	0
Passed	23,804	23,849	+45
Ignored	15,585	15,585	0
Failed	39,104	39,059	-45
Panics	363	316	-47
Conformance	30.33	30.38	+0.06%

[codecov]

Codecov Report

Merging #1031 (4b8e5b4) into master (1052ccd) will decrease coverage by 0.03%.
The diff coverage is 63.23%.

@@            Coverage Diff             @@
##           master    #1031      +/-   ##
==========================================
- Coverage   58.72%   58.68%   -0.04%     
==========================================
  Files         172      172              
  Lines       11728    11741      +13     
==========================================
+ Hits         6887     6890       +3     
- Misses       4841     4851      +10     

Impacted Files	Coverage Δ
boa/src/object/internal_methods.rs	62.93% <ø> (ø)
boa/src/builtins/regexp/mod.rs	66.46% <63.23%> (-3.67%)	⬇️

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[github-actions]

Benchmark for 19f84d4

Click to view benchmark

Test	PR Benchmark	Master Benchmark	%
Arithmetic operations (Execution)	320.7±0.17ns	302.3±0.18ns	+6.09%
Arithmetic operations (Full)	194.4±1.35µs	196.5±0.19µs	-1.07%
Array access (Execution)	6.4±0.03µs	6.5±0.08µs	-1.54%
Array access (Full)	211.8±0.27µs	214.8±0.30µs	-1.40%
Array creation (Execution)	2.4±0.00ms	2.4±0.00ms	0.00%
Array creation (Full)	2.7±0.00ms	2.6±0.00ms	+3.85%
Array pop (Execution)	911.8±2.49µs	919.3±3.37µs	-0.82%
Array pop (Full)	1280.5±1.77µs	1275.9±1.88µs	+0.36%
Boolean Object Access (Execution)	4.1±0.00µs	4.1±0.01µs	0.00%
Boolean Object Access (Full)	206.2±0.25µs	207.6±0.27µs	-0.67%
Clean js (Execution)	624.0±3.05µs	622.1±3.93µs	+0.31%
Clean js (Full)	871.5±5.92µs	868.1±7.63µs	+0.39%
Clean js (Parser)	30.7±0.05µs	30.7±0.04µs	0.00%
Create Realm	406.1±0.20ns	411.0±3.72ns	-1.19%
Dynamic Object Property Access (Execution)	4.1±0.02µs	4.2±0.01µs	-2.38%
Dynamic Object Property Access (Full)	207.9±0.37µs	210.0±0.37µs	-1.00%
Expression (Parser)	5.8±0.00µs	5.7±0.00µs	+1.75%
Fibonacci (Execution)	725.5±0.59µs	720.3±0.80µs	+0.72%
Fibonacci (Full)	954.4±0.96µs	953.8±1.09µs	+0.06%
For loop (Execution)	19.3±0.16µs	19.3±0.05µs	0.00%
For loop (Full)	227.9±0.73µs	230.2±1.12µs	-1.00%
For loop (Parser)	15.2±0.03µs	15.1±0.02µs	+0.66%
Goal Symbols (Parser)	10.1±0.02µs	10.1±0.02µs	0.00%
Hello World (Parser)	2.7±0.02µs	2.7±0.00µs	0.00%
Long file (Parser)	692.6±0.32ns	691.5±0.46ns	+0.16%
Mini js (Execution)	566.6±3.42µs	564.7±2.94µs	+0.34%
Mini js (Full)	794.2±4.48µs	799.4±3.26µs	-0.65%
Mini js (Parser)	27.0±0.05µs	27.2±0.02µs	-0.74%
Number Object Access (Execution)	3.3±0.01µs	3.2±0.01µs	+3.12%
Number Object Access (Full)	201.8±0.38µs	208.2±0.48µs	-3.07%
Object Creation (Execution)	3.5±0.01µs	3.5±0.01µs	0.00%
Object Creation (Full)	207.1±0.34µs	207.4±0.36µs	-0.14%
RegExp (Execution)	7.7±0.03µs	7.9±0.03µs	-2.53%
RegExp (Full)	216.4±0.24µs	217.0±0.45µs	-0.28%
RegExp Literal (Execution)	8.9±0.03µs	8.9±0.02µs	0.00%
RegExp Literal (Full)	212.4±0.41µs	216.1±0.59µs	-1.71%
RegExp Literal Creation (Execution)	7.7±0.03µs	7.9±0.03µs	-2.53%
RegExp Literal Creation (Full)	207.9±0.35µs	209.6±0.27µs	-0.81%
Static Object Property Access (Execution)	3.7±0.01µs	3.7±0.01µs	0.00%
Static Object Property Access (Full)	207.4±0.51µs	207.1±0.31µs	+0.14%
String Object Access (Execution)	5.7±0.02µs	5.7±0.02µs	0.00%
String Object Access (Full)	209.9±0.21µs	210.9±0.29µs	-0.47%
String comparison (Execution)	5.1±0.03µs	5.3±0.02µs	-3.77%
String comparison (Full)	207.9±1.03µs	212.0±0.34µs	-1.93%
String concatenation (Execution)	4.2±0.01µs	4.1±0.02µs	+2.44%
String concatenation (Full)	204.7±5.38µs	208.7±0.48µs	-1.92%
String copy (Execution)	3.0±0.01µs	3.1±0.01µs	-3.23%
String copy (Full)	198.9±0.39µs	203.3±0.43µs	-2.16%
Symbols (Execution)	2.6±0.00µs	2.6±0.00µs	0.00%
Symbols (Full)	195.1±0.25µs	198.2±0.45µs	-1.56%