[VTS] - Ignore macroblock for window_size calculation

[onmax]

I have observed that the election block timestamp is shifting backwards ~10 minutes every day.

Block: 4665600
Timestamp: 1733322410163
Date: 2024-12-04T14:26:50.163Z

Block: 4708800
Timestamp: 1733364958635
Date: 2024-12-05T02:15:58.635Z

Block: 4752000
Timestamp: 1733407518777
Date: 2024-12-05T14:05:18.777Z

Block: 4795200
Timestamp: 1733450065261
Date: 2024-12-06T01:54:25.261Z

Block: 4838400
Timestamp: 1733492613389
Date: 2024-12-06T13:43:33.389Z

By @Albermonte

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Knowing that the epoch last 11 hours and 50 minutes instead of 12 hours, should we modify the VTS algorithm?

Currently the window size is being calculated as follows:

I would suggest to modify epoch_duration to use microblocks only:

$$ epoch duration = block duration * microblocks per epoch $$