Blocks `countdown` enhancement

[joeldavidw]

What would you like to be added:

An enhancement to the countdown calculation logic. When the remaining blocks is < 10-15, the remaining time should be calculated using no. of remaining blocks * 30 secs instead.

Why is this needed:

When the number of remaining blocks < 10. It is common for the remaining time to be 0. As the current countdown logic is determined based on the current block's median time. This issue occurs when there are "delays" in the minting of blocks (Not every 30 secs).

Previous PR: https://github.com/DeFiCh/scan/pull/1174.

[github-actions[bot]]

@joeldavidw: Thanks for opening an issue, it is currently awaiting triage.

The triage/accepted label can be added by foundation members by writing /triage accepted in a comment.

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