Big dockerimage cleanup (#28010)
* use python3 for running run_tests.py
* update dockerimage templates
* update dockerfiles
* fix bazel build in the bazel docker image
* adjust run_tests.py to renamed php docker image
* add previously forgotten new templates
* add missing images
* php dockerfile remove whitespaces
* restore accidentally deleted binder_transport_apk image
* add back cxx_buster_x64 image
* add back php zts stretch image
* add back binder_transport_apk image
* fix bazel builds by temporarily adding back python2-dev
* check_redundant_namespace_qualifiers.py to python3
* fix clang-tidy
* make run_tests_matrix.py use python3
* fixup cxx_debian9 templates
* regenerate
* stop running dummy grpc-node tests for protobuf-at-head and boringssl-at-head jobs
* remove cxx_buster image (replaced by cxx_debian9)
* add back python_alpine_x64 image
* run_tests_in_workspace using python3
* unbreak python macos basictests by partially reverting run_tests_matrix to python2
* fix cxx_gcc_X docker images
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