feat(slack): add /critical shortcut to create incident more efficiently

[jennafauconnier]

Add Critical Incident Modal for Emergency Responses

Description

This pull request introduces a new feature that allows users to quickly create critical incidents using the /incident critical command. This streamlined process requires users to fill in only the title, description, component, priority and environment, significantly reducing the time needed to report emergencies.

Changes Made

• Implemented the /incident critical command for creating critical incidents.
• Created a modal form that requires only essential fields: title, description, component, and priority.
• Restricted the feature to "advanced users" (users in an incident response group/on-call).

Motivation and Context

This change is important as it addresses the need for a more efficient way to report critical incidents during emergency situations. By simplifying the reporting process, we ensure that users can quickly communicate essential information, facilitating faster responses.

How to Test

1. Ensure you are a member of the incident response group/on-call team.
2. In Slack, use the command /incident critical.
3. Fill in the title, description, component, and priority fields.
4. Submit the form and verify that the incident is created successfully in the system.
5. Check logs for any errors and ensure the incident appears in the incident management system.

Checklist

• I have tested my changes
• My code follows the style guidelines of this project

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 26 lines in your changes missing coverage. Please review.

Project coverage is 62.76%. Comparing base (60a7836) to head (2f7389a).

Files with missing lines	Patch %	Lines
src/firefighter/slack/views/modals/critical.py	54.34%	21 Missing ⚠️
src/firefighter/incidents/forms/create_incident.py	0.00%	3 Missing ⚠️
src/firefighter/slack/views/events/commands.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
- Coverage   62.83%   62.76%   -0.07%     
==========================================
  Files         215      216       +1     
  Lines        9587     9637      +50     
  Branches     1289     1295       +6     
==========================================
+ Hits         6024     6049      +25     
- Misses       3354     3380      +26     
+ Partials      209      208       -1     

Flag	Coverage Δ
unittests	62.76% <50.00%> (-0.07%)	⬇️

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