GitLab for Slack App error messages should recommend solutions

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Problem

When typing a slash command that is not recognized, GitLab for Slack app returns an error message that does not help the user resolve the issue.

Current error

Proposal

Update the message to include possible ways to resolve the situations. For example:

⚠️ Project not found:

1. Make sure the project path is correct. For example: /gitlab gitlab-org/gitlab issue show 123
2. Make sure the project is linked and authorized, see Chat names
3. To link a project, enable the chat integration in the project's settings. Learn more.

💻 Block kit markup