csharp: Add `brackets.scm` (#22936) #39473

Job	Run time
check_docs_only	21s
Check Postgres and Protobuf migrations, mergability	14s
Check formatting and spelling	25s
(Windows) Run Clippy and tests	11s
(macOS) Run Clippy and tests	8s
(Linux) Run Clippy and tests	5s
(Linux) Build Remote Server	4s
Create a macOS bundle	0s
Create arm64 Linux bundle	0s
Create a Linux bundle	0s
Auto release preview	0s
	1m 28s

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