Remove a few references to 'Stub' #10028

Job	Run time
Unit tests on 3.9 and ubuntu-20.04 (protobuf=latest)	12m 47s
Unit tests on 3.10 and ubuntu-20.04 (protobuf=latest)	12m 50s
Unit tests on 3.11 and ubuntu-20.04 (protobuf=latest)	11m 6s
Unit tests on 3.12 and ubuntu-20.04 (protobuf=latest)	12m 31s
Unit tests on 3.13 and ubuntu-20.04 (protobuf=latest)	10m 1s
Unit tests on 3.10 and macos-13 (protobuf=latest)	16m 52s
Check minimal container dependencies for 3.9 / 2024.04	23s
Unit tests on 3.10 and macos-14 (protobuf=latest)	10m 29s
Check minimal container dependencies for 3.12 / 2024.04	23s
Unit tests on 3.10 and windows-latest (protobuf=latest)	14m 56s
Check minimal container dependencies for 3.9 / 2024.10	18s
Unit tests on 3.9 and ubuntu-20.04 (protobuf=3.19)	13m 7s
Check minimal container dependencies for 3.13 / 2024.10	30s
Publish client package	0s
Publish base images for ${{ matrix.image-name }} ${{ matrix.image-builder-version }}	0s
	1h 56m 13s

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