fix(config): update default Datadog site to api.datadoghq.com

[meciasbueno]

Updates the default Datadog site URL from "datadoghq.com" to "api.datadoghq.com" across all configuration files, documentation, and tests. This ensures the correct API endpoint is used by default.

Changes:

• Updated DatadogSettings default site value
• Modified environment examples and docker-compose configuration
• Updated README documentation and code examples
• Adjusted test expectations to match new default
• Added PowerShell script for Docker build and run operations

This change affects the default configuration but maintains backward compatibility as the site can still be configured via environment variables or configuration files.

Description

Brief description of the changes in this PR.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)

Related Issues

Fixes #(issue number)

Changes Made

Testing

• I have tested these changes locally
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have updated the documentation accordingly

Screenshots (if applicable)

Additional Notes