fix(parser): allow HTML close comments on first line per Annex B §B.1.1

[xcb3d]

This Pull Request allows single-line HTML close comments (-->) to appear on the first line of a script per ECMAScript Annex B §B.1.1.

According to ECMAScript Annex B §B.1.1:

InputElementHashbangOrRegExp ::
    WhiteSpace
    LineTerminator
    Comment
    CommonToken
    HashbangComment
    RegularExpressionLiteral
    HTMLCloseComment

HTMLCloseComment ::
    WhiteSpaceSequence[opt] SingleLineDelimitedCommentSequence[opt] --> SingleLineCommentChars[opt]

An HTMLCloseComment is a valid input element at the start of a script under InputElementHashbangOrRegExp, optionally preceded by whitespace and single-line delimited comments (/* ... */).

Previously, BufferedLexer only called skip_html_close() after an existing LineTerminator, causing an initial --> on the first line to be lexed as punctuators Dec (--) and GreaterThan (>), resulting in an early SyntaxError.

It changes the following:

• Add first_token: bool to BufferedLexer to run an initial skip loop that calls skip_html_close() before and after consuming any initial TokenKind::Comment on the first line.
• Add missing JsNativeErrorKind::Eval match arm for ErrorType::EvalError in boa_tester's is_error_type check.
• Add parser unit test html_close_comment_first_line in core/parser/src/parser/cursor/buffered_lexer/tests.rs.
• Resolves all 3 failing test262 tests in test/annexB/language/comments/ (single-line-html-close-first-line-1.js, 2.js, 3.js), bringing test/annexB/language/comments/ to 100% conformance (8/8 passed).

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	53,578	53,578	0
Passed	51,426	51,427	+1
Ignored	1,648	1,648	0
Failed	504	503	-1
Panics	0	0	0
Conformance	95.98%	95.99%	+0.00%

Fixed tests (3):

test/annexB/language/comments/single-line-html-close-first-line-3.js (previously Failed)
test/annexB/language/comments/single-line-html-close-first-line-1.js (previously Failed)
test/annexB/language/comments/single-line-html-close-first-line-2.js (previously Failed)

Broken tests (2):

test/annexB/built-ins/Function/createdynfn-no-line-terminator-html-close-comment-params.js (previously Passed)
test/language/comments/hashbang/preceding-whitespace.js (previously Passed)

Tested main commit: 4b61183443403997a98da829dae287ce10358e1c
Tested PR commit: 38d9c7e320bd1676c12c1d027512a1d5d9aeac1a
Compare commits: 4b61183...38d9c7e

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.77%. Comparing base (6ddc2b4) to head (38d9c7e).
⚠️ Report is 1051 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/tester/src/exec/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5512       +/-   ##
===========================================
+ Coverage   47.24%   62.77%   +15.52%     
===========================================
  Files         476      536       +60     
  Lines       46892    60297    +13405     
===========================================
+ Hits        22154    37849    +15695     
+ Misses      24738    22448     -2290     

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