Support C federated tests with Rust RTI #43

Job	Run time
check-diff / check	22s
check-labels / check	2s
building / build-toolchain (ubuntu-latest)	1m 28s
cli / test-cli (ubuntu-latest)	2m 41s
building / build-toolchain (macos-latest)	1s
cli / test-cli (macos-latest)	6m 29s
building / build-toolchain (windows-latest)	1s
cli / test-cli (windows-latest)	4m 39s
lsp / test-lsp (ubuntu-latest)	7m 23s
lsp / test-lsp (macos-latest)	9m 56s
lsp / test-lsp (windows-latest)	15m 3s
building / epoch / build-epoch	7m 43s
	55m 48s

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