* MM-43753: Module workspaces
Move to module workspaces
We make the following changes:
- Remove the vendor directory.
- Dynamically create the go.work file if it doesn't exist.
- Set the MM_SERVER_PATH for enterprise tests.
https://mattermost.atlassian.net/browse/MM-43753
```release-note
NONE
```
* Fix missing reference to MM_SERVER_PATH
```release-note
NONE
```
* Update test to add another nested dir
```release-note
NONE
```
* Have separate script to create go.work file
```release-note
NONE
```
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
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