[1.0-beta1 -> main] P2P: Fix switch from lib catchup to head catchup

[heifner]

When syncing do not mark a block as applied until it is actually applied to the chain state.
Reverting this commit: AntelopeIO/leap@fdeb7fc with the comment "GH-2125 If we have the block in our dispatcher list then it is applied". The comment is wrong. A block that is in the dispatcher list is not necessarily applied. We can not assume that a block is applied just because we have added it to our received block list. We distinguish from received blocks and applied blocks in sync_manager to know the current state of syncing. The indication that the block is already applied confused sync_manager so that it doesn't request the correct blocks.

Introduced in AntelopeIO/leap#2290

Merges release/1.0-beta1 into main including #146 & #147

Resolves #141

[ericpassmore]

Note:start
group: IF
category: BUG
summary: P2P: Fix switch from lib catchup to head catchup. Fixes bug which incorrectly assumed blocks in dispatcher list were applied.
Note:end