Daily Test Coverage Improver: Add comprehensive HttpEncodings tests

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Summary

This PR adds comprehensive test coverage for the FSharp.Data.HttpEncodings module, which was previously at 66.6% coverage. The implementation provides extensive testing for encoding name resolution and codepage functionality.

Coverage Impact

• FSharp.Data.HttpEncodings: 66.6% → Improved coverage
• 9 new test methods covering all public encoding functionality
• Zero regressions: All 2,689 existing tests continue to pass

Test Coverage Details

Core Encoding Functionality

✅ Default encodings validation - PostDefaultEncoding and ResponseDefaultEncoding
✅ Encoding name resolution - Valid encoding names (UTF-8, ASCII, ISO-8859-1)
✅ Codepage resolution - Valid codepage numbers (65001→UTF-8, 1200→UTF-16)
✅ Error handling - Invalid encoding names and codepage numbers

Technical Implementation

• Framework: Uses existing NUnit + FsUnit testing patterns from the project
• Test Organization: Added new HttpEncodings.fs test file to complement existing HTTP tests
• Code Quality: Follows project formatting standards and conventions
• No Breaking Changes: Purely additive test coverage improvements

Test Results

Total tests: 9
     Passed: 9
     Failed: 0
 Total time: 34 ms

All tests pass consistently and provide comprehensive coverage of the HttpEncodings module functionality.

Quality Assurance

✅ All new tests pass - 9/9 successful test cases
✅ No regressions - All 2,689 existing tests continue to pass
✅ Code formatting - Applied project formatting standards
✅ Build verification - Clean compilation with no warnings

This work addresses the HttpEncodings module identified in coverage analysis as having lower coverage, ensuring reliability for encoding operations used throughout the FSharp.Data HTTP functionality.

Commands Executed

Bash commands:

• git checkout -b daily-test-improver-http-coverage
• dotnet build tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj
• dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --filter "FullyQualifiedName~HttpEncodings"
• dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --verbosity minimal
• dotnet run --project build/build.fsproj -- -t Format
• git add ... and git commit ... and git push ...

Web Searches: None performed
Web Pages Fetched: None

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