Adding Lag for PG follower node in status summary command

[ArvinthC3000]

🔩 Description: What code changed, and why?

As an Automate HA user, along with the service status, the user should see follower node lag for Postgresql as well in the cluster status.

Note:
For the leader node, "NA" will be shown

Previously, the cumulative cluster status can be fetched in Bastion by the chef-automate status command. Now the same can be done by the chef-automate status summary command, whereas the chef-automate status will now show the service status(on node level) of each nodes (For reference, PFA in the 'Screenshot' column below)

⛓️ Related Resources

Jira: https://chefio.atlassian.net/browse/CHEF-3561

👍 Definition of Done

👟 How to Build and Test the Change

✅ Checklist

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• I have read the CONTRIBUTING document.
• All commits signed-off for the Developer Certification of Origin.

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• Is the code clear? (complicated code or lots of comments--subdivide and use well-named methods, meaningful variable names, etc.)
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• Repeated code blocks eliminated? (adapt and reuse existing components, blocks, functions, etc.)
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• Tests added/updated? (all new code needs new tests)
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Please add a note next to any checkbox above if you are NOT ticking it.

📷 Screenshots, if applicable

Demo Video: https://progresssoftware.sharepoint.com/:v:/s/ChefCoreC/EZQhC6ZwjjpCnn3AvV_IZiUBbLHY18dlnnQCVfaR-mea4A?e=0CVU3i

The output of the chef-automate status summary command:

continued...

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