[1.0-beta1 -> main] Vote processing fix

[heifner]

• Do not post to vote thread pool if thread pool is not active.
  • This fixes a memory leak when there are no vote threads; which is why the original PR was targeted to 1.0-beta1 instead of main
• A producer should notify vote processor that it has produced a block
  • I believe this resolves issue Test Failure: svnn_ibc_unit_test_eos-vm-jit #139
• Update the tester wait on votes to be consistent

Merges release/1.0-beta1 into main including #158

Resolves #139
Resolves #143

[ericpassmore]

Note:start
group: IF
category: BUG
summary: Ensure votes are posted to an existing vote thread pool. Fixes a memory leak when there are no vote threads.
Note:end