[FEATURE REQUEST] Restart CoreDNS pods conditionally

[to-bar]

Is your feature request related to a problem? Please describe.
There is no need to restart CoreDNS on each epicli run unless cluster hosts have been changed. This is follow-up task to changes done in PR #2394.

Describe the solution you'd like
Restart CoreDNS only when needed.

Describe alternatives you've considered
Test newer version of CoreDNS to check whether it solves issue #2345.

Additional context
Code already prepared by @to-bar.

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DoD checklist

• Changelog updated
• COMPONENTS.md updated / doesn't need to be updated
• Feature has automated tests
• Automated tests passed (QA pipelines)
  • apply
  • upgrade
• Idempotency tested
• Documentation added / updated / doesn't need to be updated
• All conversations in PR resolved
• Solution meets requirements and is done according to design doc
• Usage compliant with license
• Backport tasks created / doesn't need to be backported

[przemyslavic]

✔️ Verified pgpool status and connection to PostgreSQL nodes after scaling up PostgreSQL component from 1 to 2 nodes.
CoreDNS pods are restarted conditionally, depending on changes to /etc/hosts and CoreDNS patching.