Create automated tests for bot commands

[danielleqa]

Cleanup

What should be cleaned up or changed:
We need to write tests for the Hellper commands. Available commands:

 close     Close the incident
 help      Show this help
 list      List all available commands
 list-all  List all active incidents
 ping      Test bot connectivity
 start     Create a new incident
 state     Get incident state and timeline

Provide any links for context:

[GLOFonseca]

I have edited the first comment to fit in our documentation template, also translated to English.

[GLOFonseca]

Following the strategy of not using text commands anymore, we have the following commands:

• /hellper_incident
• /hellper_status
• /hellper_resolve
• /hellper_update_dates
• /hellper_close