I've found it a bit annoying that autogenerated code shows up in
completions when working on Zed, so I've moved them into an associated
function of a struct we're "implementing" Action on. That way, neither a
generated function nor a static show up in completions.

Note that this change only affects Zed codebase! I'm pushing it up right
after last Preview to give it some time on Nightly.
Before:

![image](https://github.com/zed-industries/zed/assets/24362066/7343201f-f05b-4342-a9f7-97f002d88a48)

![image](https://github.com/zed-industries/zed/assets/24362066/e67f9dcb-e090-40e0-873c-e51bd39e0c7e)

After:

![image](https://github.com/zed-industries/zed/assets/24362066/0704211a-73f5-4f12-8583-9e47f092e5b7)

![image](https://github.com/zed-industries/zed/assets/24362066/c6fa00f5-fd8f-4f06-8be7-b74acedccd7c)


Release Notes:

- N/A