Fix spectrum library search bug for dalton tolerance

[trishorts]

This pull request improves the accuracy and robustness of spectral angle calculations in the spectral library search workflow by correctly handling both absolute (Da) and ppm mass tolerances. It also adds a new unit test to verify this behavior. The most important changes are as follows:

Spectral similarity calculation improvements:

• Updated the spectral angle calculation in SpectralLibrarySearchFunction.cs to check if the product mass tolerance is absolute or ppm, and to convert absolute tolerances to ppm based on the scan's precursor m/z. This ensures correct mass tolerance handling during spectrum similarity calculations. [1] [2] [3]

Testing enhancements:

• Added a new unit test DaltonToleranceSpectralLibrarySearchTest in SpectralLibraryReaderTest.cs to verify that spectral angle calculations work correctly when using an absolute (Dalton) mass tolerance. The test checks that the normalized spectral angle is as expected.

Dependency and SDK adjustments:

• Updated global.json to use .NET SDK version 8.0.100 and changed the roll-forward policy to latestPatch for improved stability and compatibility.

Code style and organization:

• Cleaned up and reordered using directives in SpectralLibrarySearchFunction.cs for better readability and maintainability.
• Minor formatting and whitespace adjustments for code clarity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.71%. Comparing base (4465df8) to head (bbf0125).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2594      +/-   ##
==========================================
- Coverage   94.72%   94.71%   -0.01%     
==========================================
  Files         187      187              
  Lines       19651    19658       +7     
  Branches     3635     3641       +6     
==========================================
+ Hits        18614    18620       +6     
  Misses        566      566              
- Partials      471      472       +1     

Flag	Coverage Δ
unittests	94.71% <100.00%> (-0.01%)	⬇️

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

Files with missing lines	Coverage Δ
...tralLibrarySearch/SpectralLibrarySearchFunction.cs	98.46% <100.00%> (+0.18%)	⬆️

... and 1 file with indirect coverage changes

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