Syntax highlight the JavaScript keyword `using` (#22479) #38368

Job	Run time
check_docs_only	17s
Check Postgres and Protobuf migrations, mergability	11s
Check formatting and spelling	24s
(Windows) Run Clippy and tests	31s
(Linux) Build Remote Server	3s
(Linux) Run Clippy and tests	7s
(macOS) Run Clippy and tests	8s
Create a macOS bundle	0s
Create arm64 Linux bundle	0s
Create a Linux bundle	0s
Auto release preview	0s
	1m 41s

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