Remove flask-pymongo and use only pymongo directly everywhere

[ml-evs]

Something I've wanted to do for a while -- avoids duplicate connections to the database.

[codecov]

Codecov Report

❌ Patch coverage is 83.14607% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.38%. Comparing base (7e90e05) to head (aee07d9).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pydatalab/src/pydatalab/file_utils.py	53.84%	6 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/admin.py	81.81%	4 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/blocks.py	78.94%	4 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/info.py	20.00%	4 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/auth.py	66.66%	3 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/items.py	90.90%	3 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/collections.py	88.23%	2 Missing ⚠️
pydatalab/src/pydatalab/login.py	91.66%	1 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/export.py	90.90%	1 Missing ⚠️
pydatalab/src/pydatalab/routes/v0_1/files.py	80.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1660   +/-   ##
=======================================
  Coverage   79.38%   79.38%           
=======================================
  Files          80       80           
  Lines        6940     6940           
=======================================
  Hits         5509     5509           
  Misses       1431     1431           

Files with missing lines	Coverage Δ
pydatalab/src/pydatalab/apps/echem/blocks.py	79.20% <100.00%> (ø)
pydatalab/src/pydatalab/apps/xrd/blocks.py	90.42% <100.00%> (ø)
pydatalab/src/pydatalab/export.py	84.74% <100.00%> (ø)
pydatalab/src/pydatalab/main.py	64.22% <ø> (-0.65%)	⬇️
pydatalab/src/pydatalab/mongo.py	85.07% <ø> (-0.33%)	⬇️
pydatalab/src/pydatalab/permissions.py	89.32% <100.00%> (ø)
pydatalab/src/pydatalab/routes/v0_1/graphs.py	97.70% <100.00%> (ø)
pydatalab/src/pydatalab/routes/v0_1/groups.py	100.00% <100.00%> (ø)
pydatalab/src/pydatalab/scheduler.py	84.21% <100.00%> (ø)
pydatalab/src/pydatalab/versioning.py	87.71% <100.00%> (ø)
... and 11 more

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[cypress]

datalab    Run #4806

Run Properties:   Passed #4806  •  3c790be3a5 ℹ️: Merge aee07d9018acc6206f2c53101f282321df9daa8a into 7e90e05446240f3b0a9883e61e39...

Project	datalab
Branch Review	ml-evs/remove-flask-pymongo
Run status	Passed #4806
Run duration	09m 32s
Commit	3c790be3a5 ℹ️: Merge aee07d9018acc6206f2c53101f282321df9daa8a into 7e90e05446240f3b0a9883e61e39...
Committer	Matthew Evans
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	488
View all changes introduced in this branch ↗︎