feat(distributions): add release error details

[hamdiakin]

Summary

• add optional error details to file-based and string-based distribution release models
• expose the API-provided failure message through a shared response model
• add response parsing coverage for both distribution types

Tests

• dotnet build src/Crowdin.Api/Crowdin.Api.csproj -c Release --no-restore
• env TZ=UTC dotnet test tests/Crowdin.Api.UnitTesting/Crowdin.Api.UnitTesting.csproj -c Release --no-restore (480 passed)

Closes #406

[Copilot]

🟢 Approval recommended

No unresolved review issues remain.

Pull request overview

Adds optional API failure details to file-based and string-based distribution release models.

Changes:

• Adds shared DistributionReleaseError model.
• Adds nullable error properties to both release models.
• Adds response parsing tests.

File summaries

File	Summary
tests/Crowdin.Api.UnitTesting/Tests/Distributions/DistributionsApiTests.cs	Tests error response parsing.
src/Crowdin.Api/Distributions/DistributionStringBasedRelease.cs	Adds release error details.
src/Crowdin.Api/Distributions/DistributionReleaseError.cs	Defines the shared error model.
src/Crowdin.Api/Distributions/DistributionRelease.cs	Adds release error details.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.79%. Comparing base (f45d418) to head (3052ee9).
⚠️ Report is 205 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #407       +/-   ##
===========================================
+ Coverage   50.38%   72.79%   +22.41%     
===========================================
  Files         277      486      +209     
  Lines        3688     7704     +4016     
  Branches        0      627      +627     
===========================================
+ Hits         1858     5607     +3749     
- Misses       1830     2041      +211     
- Partials        0       56       +56     

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