chore: [0.15] remove obsolete parts (#896) #3236

Job	Run time
actionlint	18s
build-python-api (windows-latest)	7m 4s
rust-lint	7m 55s
build-python-api (macos-latest)	4m 21s
build-python-api (ubuntu-latest)	3m 40s
shellcheck	18s
validate-cargo-lock	1m 16s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	2m 20s
rust-test (windows-2019)	4m 6s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 24s
rust-test (windows-2022)	2m 19s
rust-test (windows-2019, directml)	2m 53s
xtask-generate-c-header	17s
rust-test (windows-2022, directml)	3m 34s
rust-test (macos-12)	1s
rust-test (macos-13)	6h 0m 16s
rust-test (ubuntu-20.04)	4m 11s
rust-test (ubuntu-22.04)	3m 54s
	6h 51m 7s

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