update Jupyter tests

[kafonek]

Update jupyter backend tests to use a pattern that can move the asyncio loop forward until it sees certain message types. This also helps highlight a problem in test_reconnection where we sometimes miss status messages while we're disconnecting / reconnecting a socket. That will be fixed in the next PR.

[kafonek]

Current dependencies on/for this PR:

• main
  • PR update Jupyter tests #51 👈
    • PR ZMQ socket monitoring refactor #52
      • PR callback hook #53
        • PR downgrade to pre-poetry 1.2 build system #54

This comment was auto-generated by Graphite.

[codecov-commenter]

Codecov Report

Merging #51 (62b99db) into main (71313c8) will decrease coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   94.58%   94.38%   -0.21%     
==========================================
  Files           8        8              
  Lines         499      499              
==========================================
- Hits          472      471       -1     
- Misses         27       28       +1     

Impacted Files	Coverage Δ
sending/backends/jupyter.py	96.51% <0.00%> (-1.17%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 71313c8...62b99db. Read the comment docs.