Added `cargo dev setup vscode-tasks` for simplicity
This PR adds a setup command to `clippy dev` that installs tasks into the Clippy vscode workspace. These might be useful as they be used via shortcuts and are accessible over the GUI. The available tasks are:
* `cargo check` (standard Linux shortcut `[ctrl] + [shift] + b`)
* `cargo dev fmt`
* `cargo uitest` (with a comment how to add the `TESTNAME` environment value)
* `cargo test`
* `cargo dev bless`
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changelog: none
only internal changes again. cc #5394
r? `@flip1995` This should be pretty much the same as the other `cargo dev setup` commands. Would you mind reviewing this? 🙃
f4bc9cf390