Inline FileWriter and WellKnownNamespaces utility modules

[christianhelle]

Closes #1119

FileWriter (22 lines) was a pass-through that created directories and wrote
files. Inlined directly into GenerationOrchestrator.WriteSingleFile and
WriteMultipleFiles. Removed FileWriter.cs and FileWriterTests.cs.

WellKnownNamespaces (16 lines) was a pass-through that stripped
System.Collections.Generic. prefix. Inlined as a private static method
into InterfaceGenerator (3 call sites) and ParameterShared (2 call sites).
Removed WellKnownNamespaces.cs.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 624c6f42-499c-43e7-977d-662c5b5f3271

📥 Commits

Reviewing files that changed from the base of the PR and between 1804a6b and 304881e.

📒 Files selected for processing (6)

• src/Refitter.Core/InterfaceGenerator.cs
• src/Refitter.Core/ParameterShared.cs
• src/Refitter.Core/WellKnownNamespaces.cs
• src/Refitter.Tests/FileWriterTests.cs
• src/Refitter/FileWriter.cs
• src/Refitter/GenerationOrchestrator.cs

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• Commit unit tests in branch refactor-utility-modules

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.98%. Comparing base (865f5f8) to head (304881e).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1130      +/-   ##
==========================================
+ Coverage   83.98%   85.98%   +2.00%     
==========================================
  Files          40       39       -1     
  Lines        2628     2655      +27     
==========================================
+ Hits         2207     2283      +76     
+ Misses        323      271      -52     
- Partials       98      101       +3     

Flag	Coverage Δ
unittests	85.98% <100.00%> (+2.00%)	⬆️

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