Allow `\clear` to clean Duo Chat list along with `\clean`
### Problem I find it hard to remember whether the command to clean the Duo Chat screen is `/clear` or `/clean`. I essentially have a 50/50 shot to get it right. Others also have this problem: * https://gitlab.slack.com/archives/C06D5C70MD2/p1709834243236389 * https://gitlab.com/gitlab-org/gitlab/-/issues/438463#note_1785333518 * https://gitlab.com/gitlab-org/gitlab/-/issues/430124#note_1723494660 * https://gitlab.com/gitlab-org/gitlab/-/issues/430124#note_1653573302 * https://gitlab.com/orange-trial/gitlab-duo-workshop/richard-just-a-web-app/-/issues/1#note_1736431430 Also, if there is a trailing space after `/clean` it is interpreted as a question rather than a command: * https://gitlab.com/gitlab-org/gitlab-vscode-extension/-/issues/1281 ### Proposal 1. Add a new command `/clear` that behaves like the current `/clean` command in Duo Chat. 2. Make `/clear` the standard command and show it in the command options in VSCode. Update the documentation to show just `/clear` 3. Ignore preceding and trailing spaces on both commands ![image.png](/uploads/b323470af8301a7a90242cdcb1659c8d/image.png){width="322" height="257"}
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