refactor(firehose-protos): use utility function for conversion error #105

Job	Run time
cargo check	1m 27s
cargo check	1m 27s
cargo check	1m 27s
cargo check	1m 27s
cargo clippy	1m 34s
cargo clippy	1m 34s
cargo clippy	1m 34s
cargo clippy	1m 34s
cargo fmt	46s
cargo fmt	46s
cargo fmt	46s
cargo fmt	46s
cargo test	2m 58s
cargo test	2m 51s
cargo test	2m 55s
cargo test	3m 30s
cargo test docs code snippets	1m 36s
cargo test docs code snippets	1m 36s
cargo test docs code snippets	1m 36s
cargo test docs code snippets	1m 36s
	33m 46s

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