[APIView] Disable build step Create API Review for private repos

[maririos]

Fixes #3427

[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

[praveenkuttappan]

Looks good

[weshaggard]

I think this will work for now. However we might need another solution later if we find that the "-pr" naming convention isn't a strong enough condition.

[maririos]

@weshaggard Agree. I also looked into all steps to see which ones had a similar behavior and so far only 2 (including this one) have it, so decided it was ok for now. If we start having more, then maintaining the behavior on individual steps might not be ideal.

[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow

[weshaggard]

@maririos this will be your first eng/common PR. There is a link with instructions on how to process it but let me know if you need any help.

[ghost]

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