Remove unused PATH_TO_PPC_PROJECT definition #2928

Job	Run time
lint / clang-format	9s
lint / python-lint	5s
windows / windows-msvc-build-debug	6m 56s
ubuntu / ubuntu-gcc-build-debug (ubuntu-24.04)	1m 18s
ubuntu / ubuntu-gcc-build (ubuntu-24.04-arm)	2m 1s
windows / windows-msvc-build	2m 38s
ubuntu / ubuntu-gcc-build (ubuntu-24.04)	1m 18s
mac / macos-clang-build	2m 51s
ubuntu / ubuntu-clang-build (ubuntu-24.04-arm)	2m 34s
ubuntu / ubuntu-clang-build (ubuntu-24.04)	1m 39s
mac / macos-clang-build-debug	2m 3s
windows / windows-clang-build	2m 41s
ubuntu / ubuntu-gcc-test (ubuntu-24.04-arm)	5m 26s
ubuntu / ubuntu-gcc-test (ubuntu-24.04)	4m 34s
windows / windows-msvc-test	2m 14s
mac / macos-clang-test	3m 33s
windows / windows-clang-test	1m 16s
windows / windows-clang-test-extended	1m 19s
windows / windows-msvc-test-extended	1m 31s
mac / macos-clang-test-extended	2m 8s
ubuntu / ubuntu-clang-test (ubuntu-24.04-arm)	5m 28s
ubuntu / ubuntu-clang-sanitizer-build (ubuntu-24.04)	1m 35s
ubuntu / ubuntu-clang-test (ubuntu-24.04)	4m 48s
ubuntu / ubuntu-gcc-test-extended (ubuntu-24.04)	3m 36s
ubuntu / ubuntu-gcc-test-extended (ubuntu-24.04-arm)	3m 22s
ubuntu / ubuntu-clang-test-extended (ubuntu-24.04)	3m 4s
ubuntu / ubuntu-clang-test-extended (ubuntu-24.04-arm)	4m 19s
ubuntu / ubuntu-clang-sanitizer-test (ubuntu-24.04)	1m 54s
ubuntu / ubuntu-clang-sanitizer-test-extended (ubuntu-24.04)	1m 46s
ubuntu / ubuntu-gcc-build-codecov	3m 59s
perf / ubuntu-gcc-build-perf-stats	1m 33s
	1h 23m 38s

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