fix(eslint-plugin-template): [eqeqeq] Calculate offset to find true absolute source span

[estevezluis]

Fixes #1666

Problem:
In angular's parser, leading whitespace or newline is ignored when calculating AbsoluteSourceSpan. ¹²

Solution:
This PR finds the true AbsoluteSourceSpan by calculating the leading trivia characters offset.

Assistance requested:
Not sure how to add a leading newline (e.g. code snippet in #1666) in annotatedSource without causing issues in annotatedOutput.

Reference

Footnotes

1. https://github.com/angular/angular/blob/main/packages/compiler/src/ml_parser/lexer.ts#L87 ↩

2. https://hackmd.io/@X3ECPVy-RCuVfba-pnvIpw/BkDUxaW84/%2FMA1oxh6jRXqSmZBcLfYdyw?type=book)%5C#Parser ↩

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✅ Successfully ran 8 targets

• nx run-many -t e2e-suite --parallel 1
• nx run-many -t build,typecheck,check-rule-docs,lint
• nx run-many -t test --codeCoverage
• nx-cloud record -- yarn format-check
• nx-cloud record -- yarn lint
• nx run-many -t test
• nx run-many -t build
• nx release publish --tag canary

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[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.61%. Comparing base (8294112) to head (96dc5f9).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1709      +/-   ##
==========================================
+ Coverage   89.56%   89.61%   +0.04%     
==========================================
  Files         171      172       +1     
  Lines        3202     3217      +15     
  Branches      544      545       +1     
==========================================
+ Hits         2868     2883      +15     
- Misses        198      199       +1     
+ Partials      136      135       -1     

Flag	Coverage Δ
unittest	89.61% <80.00%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...eslint-plugin-template/tests/rules/eqeqeq/cases.ts	100.00% <ø> (ø)
...ackages/eslint-plugin-template/src/rules/eqeqeq.ts	92.68% <80.00%> (+2.05%)	⬆️

[estevezluis]

Not sure how to test the code format change 😄

[JamesHenry]

Thanks a lot for this @estevezluis!