Update the list of supported namespaces which are exceptions

[ohmayr]

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Summary of the issue

As part of librarian release, we validate the namespace of the library being updated or released. A valid namespace is one of google, google.cloud or google.ads. However, we do have exceptions for libraries which are already released under a different namespace such as google.cloud.billing. Update the list of exceptions to avoid blocking a release for one of these libraries.

API client name and version

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Reproduction steps: code

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Reproduction steps: supporting files

file: mydata.csv

alpha,1,3
beta,2,5

Reproduction steps: actual results

file: output.txtmydata.csv

Calculated: foo

Reproduction steps: expected results

file: output.txtmydata.csv

Calculated: bar

OS & version + platform

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Python environment

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Python dependencies

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Additional context

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