fix(dashmate): config is not persisted after migration

[shumkov]

Issue being fixed or feature implemented

When dashmate migrate config to the new version, it should be persist back to disk, but it's not. So dashmate migrate config every command call without actual effect of this migration.
There are few commands that mutate config. It should be persisted in this case too.

What was done?

• Keep status of changes for configs and config file
• Persist config file if changed
• Render templates for a config if it was changed

How Has This Been Tested?

None

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[pshenmic]

It works