chore: Enable clang-tidy bugprone-reserved-identifier check

[godexsoft]

High Level Overview of Change

This PR enables clang-tidy bugprone-reserved-identifier check.

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)
• Performance (increase or change in throughput and/or latency)
• Tests (you added tests for code that already exists, or your new feature included in this PR)
• Documentation update
• Chore (no impact to binary, e.g. .gitignore, formatting, dropping support for older tooling)
• Release

API Impact

• Public API: New feature (new methods and/or new fields)
• Public API: Breaking change (in general, breaking changes should only impact the next api_version)
• libxrpl change (any change that may affect libxrpl or dependents of libxrpl)
• Peer protocol change (must be backward compatible or bump the peer protocol version)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.8%. Comparing base (92983d8) to head (30d7767).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #6456     +/-   ##
=========================================
- Coverage     79.9%   79.8%   -0.0%     
=========================================
  Files          862     862             
  Lines        67875   67875             
  Branches      7546    7552      +6     
=========================================
- Hits         54203   54188     -15     
- Misses       13672   13687     +15     

Files with missing lines	Coverage Δ
src/libxrpl/tx/invariants/InvariantCheck.cpp	95.8% <100.0%> (ø)

... and 8 files with indirect coverage changes

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[Copilot]

Pull request overview

Enables the clang-tidy bugprone-reserved-identifier check and updates code to avoid triggering it, improving static analysis coverage and preventing use of C++ reserved identifier patterns in the codebase.

Changes:

• Enabled bugprone-reserved-identifier in .clang-tidy.
• Renamed a structured-binding component in AccountRootsDeletedClean::finalize to avoid a reserved identifier (__).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/libxrpl/tx/invariants/InvariantCheck.cpp	Avoids a reserved identifier in a structured binding used during invariant checks.
.clang-tidy	Turns on the bugprone-reserved-identifier clang-tidy check.

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[pratikmankawde]

Looks good. Left a minor suggestion.