CLI: Use the new DELETE project endpoint

See the description for https://app.clickup.com/t/861nayppe and https://app.clickup.com/t/861nayqwz and mimic the same in the py-client/plugin.

The existing remove CLI function:

• should use the POST v2/project/{id}/scheduleDelete by default and returns when the project will be deleted
• should have a new flag -f, --force-delete to remove the project immediately by calling DELETE /project/{id}

Also, add a help text to that CLI function explaining that normal remove will schedule the project for deletion and the force will remove it forever immediately.

In autotests, use the new version (immediate delete) when doing cleanup.

Comments
Martin D: immediate removal of projects added to python API: https://github.com/MerginMaps/mergin-py-client/pull/177
Martin D: For the time being, clients still use the "old" v1 delete endpoint - we should switch to the v2 delete endpoint only after some time when also CE/EE servers are likely to be migrated already...

Migrated from: https://app.clickup.com/t/861nayu2h

从 py-client/plugin 中现有的 remove CLI 函数以及清理项目的 autotests 开始。将其当前的删除请求与 v2 scheduleDelete 和立即 DELETE 端点进行比较，然后通过相关测试验证帮助文本、force-delete 选项、返回的计划信息以及清理行为。