chore: [0.15] remove obsolete parts #3227

Job	Run time
rust-lint	7m 6s
actionlint	19s
rust-test (windows-2019)	6m 48s
shellcheck	17s
rust-test (windows-2022)	7m 46s
rust-test (windows-2019, directml)	6m 45s
validate-cargo-lock	1m 17s
xtask-generate-c-header	1m 39s
rust-test (windows-2022, directml)	6m 42s
rust-test (macos-12)	1s
rust-test (macos-13)	6h 0m 14s
rust-test (ubuntu-20.04)	3m 59s
rust-test (ubuntu-22.04)	3m 51s
build-python-api (windows-latest)	7m 19s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	2m 4s
build-python-api (macos-latest)	5m 16s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	2m 25s
build-python-api (ubuntu-latest)	3m 35s
	7h 7m 23s

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