SHOT-4558: Do not raise exception on api import failure

[staceyoue]

• The api module may fail to load due to incompatible Qt version between Alias and FPT (it is expected that they would have different Qt versions)
• Instead of raising exception, set to the module to None
• In some cases tk-framework-alias package needs to be imported, but does not require the api module, so let the caller still import and use the framework without the api module
• This is a bit of a work around until the Alias api DLL does not create a Qt dependency

[Copilot]

Pull Request Overview

This PR modifies the Alias Python API import handling to gracefully handle import failures instead of raising exceptions. The change allows the tk-framework-alias package to be imported even when the API module fails to load due to version incompatibilities between Alias and the Python environment.

• Replace exception raising with warning message when API import fails
• Set the api_module to None instead of crashing on import failure
• Enhance error messaging to provide more detailed troubleshooting information

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