Mathieu lamiot/issue15

[MathieuLamiot]

Description

Add a slash command to the Slack bot that will open a modal similar to the one of escalation dev team workflow, a then create a GitHub task with a dedicated type, send a DM and send a public message in a dedicated channel.

Fixes #15

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality).

Is the solution different from the one proposed during the grooming?

It is different: Workflow steps from apps will be deprecated soon so I went in another direction with a slash command. The handling of this command is the same as anticipated for the workflow step, but the trigger is different.

Checklists

Generic development checklist

• My code follows the style guidelines of this project, with adapted comments and without new warnings.
• I have added unit and integration tests that prove my fix is effective or that my feature works.
• The CI passes locally with my changes (including unit tests, integration tests, linter).

Test summary

• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I validated all Acceptance Criteria of the related issues. (If applicable, provide proof).