Fix the model type selector when the model type is unknown

[ppadti]

Description

This PR aims to fix the register flow from model catalog when the model type is unknown.
before:

after:

How Has This Been Tested?

To test in mock mode:
Update the static_mock_data.go file to have model_type as unknown and check the register flow from catalog.

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

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[Philip-Carneiro]

/lgtm

[google-oss-prow]

@Philip-Carneiro: changing LGTM is restricted to collaborators

Details

In response to this:

/lgtm

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