jsonrpc: don't explicitly remove old tables #77521

Job	Run time
diff	7s
license-check	1m 6s
test (ubuntu-ghcloud)	26m 38s
test-extra (ubuntu-ghcloud)	25m 43s
clippy	3m 17s
move-auto-formatter-ci-test	0s
simtest	15m 40s
windows-build (windows-ghcloud)	12m 20s
cargo-deny (bans, licenses, sources)	36s
cargo-deny (advisories)	35s
move-test	0s
rustfmt	19s
cutting a new execution layer	1m 27s
test-extra	0s
test	0s
	1h 27m 48s

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