Clean up warnings in examples

[tg123]

No description provided.

[Copilot]

Pull Request Overview

This PR cleans up warnings in the sample projects by removing unnecessary namespace and class wrappers and leveraging top‑level statements and new language features.

• Removed redundant using directives and async Main methods.
• Updated comments and documentation parameters.
• Adopted modern C# patterns for top‑level statements across multiple examples.

Reviewed Changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/yaml/Program.cs	Removed threading-related using and wrapper class/namespace for top‑level code.
examples/webApiDependencyInjection/Controllers/ExampleDependencyInjectionOnMethodController.cs	Improved XML comments and added null-check with ArgumentNullException.ThrowIfNull.
examples/webApiDependencyInjection/Controllers/ExampleDependencyInjectionOnConstructorController.cs	Updated documentation and refined the method signature for clarity.
examples/watch/Program.cs	Converted callback method into a top‑level function with updated warning suppression.
examples/simple/PodList.cs	Refactored from namespace encapsulation to top‑level code.
examples/portforward/PortForward.cs	Converted the Forward method to a top‑level async function.
examples/patch/Program.cs	Removed namespace/class wrappers, updated PrintLabels to a top‑level function.
examples/namespace/NamespaceExample.cs	Eliminated namespace declaration to allow top‑level function definitions.
examples/metrics/Program.cs	Converted multiple async methods to top‑level functions.
examples/logs/Logs.cs	Removed namespace and async Task structure in favor of top‑level statements.
examples/labels/PodList.cs	Simplified structure by removing redundant namespace/class wrappers.
examples/generic/Generic.cs	Refactored out of namespace for top-level code style.
examples/exec/Exec.cs	Converted methods to top-level functions while retaining async invocation.
examples/csrApproval/Program.cs	Updated the X509EnhancedKeyUsageExtension initializer to utilize new syntax.
examples/attach/Attach.cs	Changed AttachToPod to a top-level async function format.

Files not reviewed (1)

• Directory.Build.props: Language not supported

[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, tg123

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