Refactor Google Secrets integration to support options and improve configuration handling

[neotrow]

This pull request introduces several significant changes to the GoogleSecrets configuration functionality. The most important updates include the addition of a new overload for AddGoogleSecrets, the removal of redundant code, and enhancements to the handling of GoogleSecretsOptions.

Key Changes:

New Features:

• Added a new overload for AddGoogleSecrets to allow passing GoogleSecretsOptions.

Code Simplification:

• Removed the redundant environment variable check for GoogleSecretsProject in ConfigurationBuilderExtensions. [1] [2]
• Simplified the AddGoogleSecrets method by removing the check for ProjectName in GoogleSecretsOptions.

Enhancements:

• Set the ProjectName property in GoogleSecretsOptions to default to the environment variable GoogleSecretsProject if available.
• Added a warning log and early return in GoogleSecretsProvider if ProjectName is not set.

[Copilot]

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

GoogleSecrets/ConfigurationBuilderExtensions.cs:35

• Removing the explicit exception for missing ProjectName may lead to silent misconfiguration. If the behavior is intentional and relying on the provider to log a warning, please ensure that this change is clearly documented.

if (string.IsNullOrWhiteSpace(googleSecretsOptions.ProjectName)) { throw new ArgumentNullException(nameof(googleSecretsOptions.ProjectName)); }