Better estimate staking rewards after Damask

[lukaw3d]

Current chart estimates https://docs.oasis.io/general/oasis-network/token-metrics-and-distribution/#staking-incentives we are at epoch 27138, but we are already at 27359.

This estimates epoch duration differently for epochs made since -1 year ago.
Note: this doesn't only affect epoch to date calculation. It also affects APY calculation: how many epochs fit in one year.

Before	After
DEV: estimatedEpochsPerHour 1.003339695445333 DEV: diff between estimates and known dates at beta (0): +14.1 hours at mainnet (1170): +0 hours at block4M (6664): +9 hours at block5M (8328): +5.8 hours at block6M (9992): -1.3 hours at block7M (11656): +2 hours at block8M (13320): +17.3 hours at block9M (14987): +5.4 hours at block10M (16653): -6 hours at block11M (18320): -22.2 hours at block12M (19987): -47.3 hours at block13M (21653): -73 hours at block14M (23320): -110.2 hours at block15M (24987): -148.5 hours at block16M (26653): -186 hours	DEV: estimatedEpochsPerHourPreDamask 1.003339695445333 DEV: estimatedEpochsPerHourAfterDamask 1.0252064282899003 DEV: diff between estimates and known dates at beta (0): +14.1 hours at mainnet (1170): +0 hours at block4M (6664): +9 hours at block5M (8328): +5.8 hours at block6M (9992): -1.3 hours at block7M (11656): +2 hours at block8M (13320): +17.3 hours at block9M (14987): +5.4 hours at block10M (16653): -6 hours at block11M (18320): -22.2 hours at block12M (19987): +0 hours at block13M (21653): +9.7 hours at block14M (23320): +7.9 hours at block15M (24987): +5 hours at block16M (26653): +3 hours

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