fix(code-editor): minor ux issues

[allardy]

Fixes 3 small issues I've encountered on the code editor:

1. You could create .json files but couldn't delete them in the libraries section
2. CTRL+A to select the file content was broken for files without wrapper (ex: bot config, botpress config, js files in lib section)
3. Only adding the wrapper to .js files in the actions folder (if you create a json file, it would wrap it and it was weird)

[laurentlp]

@allardy Nice work, everything works as described except the last point where I still have the function wrapper with JSON files. Not sure if this is what we want?

simplescreenrecorder-2022-03-15_10.25.11.mp4

[allardy]

Good catch, that's not the wrapper but the template. Fixed :)

[EFF]

Doesn't seem to be related but e2e are failing. can we fix this ?