feat: Enhance CI workflow, logging, and optimized S3 bucket operations

[ZUOXIANGE]

Hi @loverustfs , could you please review this PR when you have a moment?

[ZUOXIANGE]

Would you consider granting me maintainer access? I'd love to help keep this project running smoothly. @loverustfs

[loverustfs]

Ok

[Copilot]

Pull request overview

This PR updates the demo’s CI/build policies and improves runtime observability and S3 bucket/file operations, while also modernizing the test stack.

Changes:

• Added source-generated logging for RustFSService operations and GlobalExceptionHandler.
• Optimized S3 bucket existence checks and bucket deletion (including objects) via AmazonS3Util.
• Updated CI workflow (lint + multi-OS build matrix) and migrated tests to xUnit v3 with cancellation token usage.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/RustFS.Demo.Tests/RustFSServiceTests.cs	Updates async lifetime + propagates xUnit v3 cancellation token into async calls.
tests/RustFS.Demo.Tests/RustFS.Demo.Tests.csproj	Migrates to xunit.v3 and suppresses CA1707 for underscore-style test names.
src/RustFS.Demo.Web/wwwroot/index.html	Improves client-side error handling by extracting server messages from error responses.
src/RustFS.Demo.Web/Services/RustFSServiceLogExtensions.cs	Introduces source-generated log extension methods for bucket/file operations.
src/RustFS.Demo.Web/Services/RustFSService.File.cs	Adds operation logging around presign/upload/get/delete/list file flows.
src/RustFS.Demo.Web/Services/RustFSService.Bucket.cs	Uses AmazonS3Util for bucket existence and deletes buckets with objects; adds logging.
src/RustFS.Demo.Web/Services/IRustFSService.cs	Removes trailing whitespace.
src/RustFS.Demo.Web/Program.cs	Simplifies S3 client creation overload usage and reorders usings.
src/RustFS.Demo.Web/Models/UploadResult.cs	Removes trailing whitespace.
src/RustFS.Demo.Web/Models/S3StorageOptions.cs	Removes trailing whitespace.
src/RustFS.Demo.Web/Infrastructure/GlobalExceptionHandler.cs	Switches to source-generated logging for exception logging.
src/RustFS.Demo.AppHost/Program.cs	Removes trailing whitespace.
Directory.Packages.props	Central package update for xUnit v3.
Directory.Build.props	Adds repo-wide build/analyzer settings (warnings as errors, analysis level, code style enforcement).
.github/workflows/ci.yml	Adds lint job and changes build/test execution strategy across OS matrix.
.github/dependabot.yml	Adds dependency update grouping for Microsoft/OpenTelemetry packages.
.editorconfig	Replaces prior config with a simplified, repo-wide formatting + C# style baseline.

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[ZUOXIANGE]

@loverustfs fix it