Improve log when secret is not found in keyVault

[RohrerF]

This pull request introduces improvements to error handling and logging when interacting with Azure Key Vault. The changes primarily focus on providing more detailed error messages by including the path of the secret that caused the error.

Improvements to error handling:

• src/Confix.Tool/src/Confix.Library/ThrowHelper.cs: Modified the SecretNotFound method to accept an optional path parameter and include it in the error message if provided.

Updates to method signatures:

• src/Confix.Tool/src/Confix.Library/Utilities/Azure/KeyVaultExtension.cs: Updated the HandleKeyVaultException method to accept an optional path parameter and pass it to the SecretNotFound method.

Enhancements to Azure Key Vault provider:

• src/Confix.Tool/src/Confix.Library/Variables/Providers/AzureKeyVault/AzureKeyVaultProvider.cs: Updated the ResolveAsync and SetAsync methods to pass the path parameter to the HandleKeyVaultException method. [1] [2]- mention secret path in error message when available

[Copilot]

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Comments suppressed due to low confidence (1)

src/Confix.Tool/src/Confix.Library/Utilities/Azure/KeyVaultExtension.cs:9

• [nitpick] Consider renaming the parameter 'path' to 'secretPath' for clearer intent that it represents the secret's key path.

public static async Task<T> HandleKeyVaultException<T>(Func<Task<T>> action, string? path = null)