Replace Cursor#observeChanges calls with MongoDB change streams

[make-github-pseudonymous-again]

This is progress on:

• Try to exploit Change Streams instead of observe/observeChanges #999
• Add unit tests for subscriptions #656

[codecov]

Codecov Report

Attention: Patch coverage is 95.94595% with 30 lines in your changes missing coverage. Please review.

Project coverage is 69.06%. Comparing base (28c94e2) to head (db10212).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
imports/api/query/watch.ts	89.65%	3 Missing and 3 partials ⚠️
imports/api/createTagCollection.ts	37.50%	5 Missing ⚠️
imports/api/publication/publishCursors.tests.ts	96.03%	4 Missing ⚠️
imports/api/publication/stats/frequencyBySex.ts	95.00%	2 Missing and 1 partial ⚠️
imports/api/consultations.ts	87.50%	1 Missing and 1 partial ⚠️
imports/api/events.ts	0.00%	2 Missing ⚠️
imports/api/makeObservedQueryPublication.ts	80.00%	0 Missing and 2 partials ⚠️
imports/api/publication/define.ts	83.33%	2 Missing ⚠️
imports/api/makeFilteredCollection.ts	50.00%	1 Missing ⚠️
imports/api/publication/publishCursors.ts	96.42%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1003      +/-   ##
==========================================
+ Coverage   66.63%   69.06%   +2.43%     
==========================================
  Files         719      733      +14     
  Lines       10006    10653     +647     
  Branches     1349     1353       +4     
==========================================
+ Hits         6667     7358     +691     
+ Misses       2879     2833      -46     
- Partials      460      462       +2     

Flag	Coverage Δ
client	49.84% <83.10%> (+3.65%)	⬆️
server	60.11% <35.40%> (-2.53%)	⬇️
test	75.79% <94.39%> (+3.22%)	⬆️
test-app	54.13% <63.60%> (+<0.01%)	⬆️

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[make-github-pseudonymous-again]

Superseded by:

• Get rid of oplog dependency #1032