Adding support for ClientOM 19 and 20 in PowerShell task SDK

[MantavyaDh]

This pull request updates the credential handling logic in the ServerOMFunctions.ps1 PowerShell script to improve compatibility with newer versions of the Client Object Model (ClientOM) for Azure DevOps/TFS. The changes prioritize the use of newer authentication types when available, while maintaining support for legacy credentials.

Credential Handling Improvements:

• The Get-TfsClientCredentials function now attempts to use VssClientCredentials (available in ClientOM 14+) before falling back to the legacy TfsClientCredentials. It also dynamically selects the appropriate federated credential type (VssOAuthAccessTokenCredential for ClientOM 16+, or VssOAuthCredential for ClientOM 14).

Assembly Resolution Enhancements:

• The Get-OMType function now additionally checks for Interactive.dll when resolving types, ensuring support for scenarios where VssClientCredentials has moved to this assembly in ClientOM 16+.

[MantavyaDh]

/azp run

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