fix(dapi): internal errors if broadcasting failed

[shumkov]

Issue being fixed or feature implemented

When Tenderdash under heavy load DAPI fails to connect to it to broadcast a state transition and fails with the socket hang up error. We also need to handle a new check tx timeout introduced in tenderdash.

What was done?

• handle the socket hang up error and return the unavailable error code.
• handle broadcast confirmation not received error
• update tests

How Has This Been Tested?

None

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[markin-io]

utACK

[pshenmic]

good!