Support C federated tests with Rust RTI #36

Job	Run time
check-diff / check	34s
check-labels / check	2s
building / build-toolchain (ubuntu-latest)	1m 15s
building / build-toolchain (macos-latest)	1s
building / build-toolchain (windows-latest)	1s
lsp / test-lsp (ubuntu-latest)	7m 8s
lsp / test-lsp (macos-latest)	13m 47s
lsp / test-lsp (windows-latest)	13m 44s
cli / test-cli (ubuntu-latest)	2m 50s
cli / test-cli (macos-latest)	3m 28s
cli / test-cli (windows-latest)	4m 11s
building / epoch / build-epoch	7m 36s
	54m 37s

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