[Merged by Bors] - Make if statements return their completion values

[raskad]

This Pull Request changes the following:

• Adjust if statement execution to leave their resulting values on the stack when needed.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	94,277	94,277	0
Passed	71,086	71,092	+6
Ignored	17,324	17,324	0
Failed	5,867	5,861	-6
Panics	2	2	0
Conformance	75.40%	75.41%	+0.01%

Fixed tests (6):

test/language/statements/if/cptn-else-false-nrml.js [strict mode] (previously Failed)
test/language/statements/if/cptn-else-false-nrml.js (previously Failed)
test/language/statements/if/cptn-no-else-true-nrml.js [strict mode] (previously Failed)
test/language/statements/if/cptn-no-else-true-nrml.js (previously Failed)
test/language/statements/if/cptn-else-true-nrml.js [strict mode] (previously Failed)
test/language/statements/if/cptn-else-true-nrml.js (previously Failed)

[codecov]

Codecov Report

Merging #2739 (823028a) into main (8d16940) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2739      +/-   ##
==========================================
+ Coverage   50.16%   50.28%   +0.11%     
==========================================
  Files         400      399       -1     
  Lines       40164    40044     -120     
==========================================
- Hits        20149    20135      -14     
+ Misses      20015    19909     -106     

Impacted Files	Coverage Δ
boa_engine/src/bytecompiler/statement/if.rs	100.00% <100.00%> (ø)
boa_engine/src/bytecompiler/statement/mod.rs	94.11% <100.00%> (ø)

... and 13 files with indirect coverage changes

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[Razican]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded:

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