Nicer messages while reloading configuration after Source Bindings edit

[pkosiec]

Overview

This is a follow-up of https://github.com/kubeshop/botkube/issues/704.

Currently, when editing Source Bindings, BotKube app needs to restart to apply new configuration. In a result, it posts the following messages:

However, as suggested in the investigation, we can improve the messages.

Acceptance Criteria

• Implement nicer messages according to the investigation: https://github.com/kubeshop/botkube/blob/main/docs/investigation/configuration/2022-09-07-persistent-cfg-from-commands.md#3-distinguish-two-types-of-commands-and-restart-if-necessary
• Use system ConfigMap https://github.com/kubeshop/botkube/blob/main/helm/botkube/values.yaml#L495 - and reuse logic @mszostok introduced

Reason

Improve UX.

[lpetkov]

Let me know I can help with this one.

[pkosiec]

Thanks @lpetkov! We'll definitely get back to you after it's scheduled for one of upcoming releases 👍