chore(tonic): Move ConnectError type from transport #2935

Job	Run time
cargo-deny check	19s
Interop Tests (ubuntu-latest)	39s
check (ubuntu-latest)	1m 51s
codegen	18s
check (macOS-latest)	1m 34s
check (windows-latest)	3m 17s
Check MSRV	42s
Interop Tests (macOS-latest)	45s
rustfmt	13s
Interop Tests (windows-latest)	2m 58s
test (ubuntu-latest)	2m 40s
Check unused dependencies (ubuntu-latest)	3m 42s
test (macOS-latest)	1m 48s
Check unused dependencies (macOS-latest)	3m 17s
test (windows-latest)	4m 5s
Check unused dependencies (windows-latest)	7m 33s
	35m 41s

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