Fix spaces around module selectors in generics

[Copilot]

When a module selector (::) appears inside generic angle brackets, the tokenizer didn't recognize :: as a valid operator within a generic scope. This caused < to be reclassified from startOfScope to operator, and spaceAroundOperators then inserted spaces around it:

// Before (incorrect)
let x: AnyPublisher <ModuleName::EntityName, Never>

// After (correct)
let x: AnyPublisher<ModuleName::EntityName, Never>

• Added "::" to the whitelist of operators allowed inside <...> generic scopes in Tokenizer.swift

• Fixes Spaces around module selectors #2657

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.46%. Comparing base (df2c5bd) to head (600204b).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2660   +/-   ##
========================================
  Coverage    95.45%   95.46%           
========================================
  Files          178      178           
  Lines        27137    27137           
========================================
+ Hits         25904    25905    +1     
+ Misses        1233     1232    -1     

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