feat(errors): add coroutine template diagnostics #155

Job	Run time
Build (gcc)	3m 41s
Configuration Coverage	7m 13s
Build (clang)	4m 8s
Runtime Smoke Checks	3m 47s
Valgrind Checks	3m 44s
Static Analysis	6m 42s
Standalone Package Export Check	4m 19s
CLI Strict CI Summary	4s
	33m 38s

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