jsonrpc: correctly serialize bcsName field #80285

Job	Run time
diff	9s
license-check	1m 3s
simtest	15m 36s
test (ubuntu-ghcloud)	27m 29s
windows-build (windows-ghcloud)	9m 21s
cargo-deny (bans, licenses, sources)	38s
cargo-deny (advisories)	44s
clippy	3m 25s
move-test	0s
rustfmt	22s
cutting a new execution layer	1m 25s
test-extra (ubuntu-ghcloud)	28m 33s
test-extra	0s
test	0s
	1h 28m 45s

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