Support C federated tests with Rust RTI #39

Job	Run time
check-labels / check	2s
check-diff / check	16s
cli / test-cli (ubuntu-latest)	2m 59s
lsp / test-lsp (ubuntu-latest)	7m 3s
building / build-toolchain (ubuntu-latest)	1m 17s
cli / test-cli (macos-latest)	4m 13s
lsp / test-lsp (macos-latest)	12m 4s
building / build-toolchain (macos-latest)	1m 44s
cli / test-cli (windows-latest)	5m 1s
lsp / test-lsp (windows-latest)	14m 25s
building / build-toolchain (windows-latest)	1m 42s
building / epoch / build-epoch	4m 57s
	55m 43s

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