Change UpgradeTimeout to from absolute to relative

[chatton]

Summary

Change the default upgrade timeout from absolute to relative. see this comment

Having looked briefly into this, it might be able to look like this

// getUpgradeTimeout returns the absolute timeout for the given upgrade.
func (k Keeper) getUpgradeTimeout(ctx sdk.Context) types.Timeout {
	relativeTimeout := k.GetParams(ctx).UpgradeTimeout
	absoluteTimeoutHeight := clienttypes.NewHeight(clienttypes.ParseChainID(ctx.ChainID()), uint64(ctx.BlockHeight())+relativeTimeout.Height.RevisionHeight)
	absoluteTimeoutTimestamp := uint64(ctx.BlockTime().UnixNano()) + relativeTimeout.Timestamp
	return types.NewTimeout(absoluteTimeoutHeight, absoluteTimeoutTimestamp)
}

However tests are failing with timeout issues in the HasPassed method. This needs to be figured out.

	selfTime, timeoutTimestamp := uint64(ctx.BlockTime().UnixNano()), t.Timestamp
	if selfTime >= timeoutTimestamp && timeoutTimestamp > 0 {
		return true, errorsmod.Wrapf(ErrInvalidUpgrade, "block timestamp >= upgrade timeout timestamp (%s >= %s)", ctx.BlockTime(), time.Unix(0, int64(timeoutTimestamp)))
	}

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[chatton]

We are now no longer using timeout height for upgrades. We should make the timeout timestamp relative.