Add _experimental_buffer_containers #8825

Job	Run time
Check minimal container dependencies for 3.8	29s
Unit tests on 3.8 and ubuntu-20.04 (protobuf=latest)	9m 54s
Check minimal container dependencies for 3.9	27s
Unit tests on 3.9 and ubuntu-20.04 (protobuf=latest)	9m 57s
Check minimal container dependencies for 3.10	27s
Unit tests on 3.10 and ubuntu-20.04 (protobuf=latest)	10m 11s
Check minimal container dependencies for 3.11	28s
Unit tests on 3.11 and ubuntu-20.04 (protobuf=latest)	9m 6s
Check minimal container dependencies for 3.12	28s
Unit tests on 3.12 and ubuntu-20.04 (protobuf=latest)	10m 33s
Unit tests on 3.10 and macos-12 (protobuf=latest)	14m 26s
Unit tests on 3.10 and macos-14 (protobuf=latest)	10m 22s
Unit tests on 3.10 and windows-latest (protobuf=latest)	14m 0s
Unit tests on 3.8 and ubuntu-20.04 (protobuf=3.19)	10m 8s
Publish base images for ${{ matrix.image-name }} ${{ matrix.image-builder-version }} on ${{ matrix.python-version }}	0s
Publish client package	0s
	1h 40m 56s

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