Introduce dismiss policy for Toast view

[danielebogo]

📘 Part of: #2703

To be able to decide whether or not the Toast menu should auto dismiss, I introduced a policy enum to handle both cases:
• never
• interval

If the policy is set to never, the timer is never associated.
By default the policy is the interval keeping the same value as before.

To test

• Run the app
• Make sure the Toast continue working as before

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

	1 Warning
⚠️	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.

Generated by 🚫 Danger

[SergioEstevao]

Good refactor!