Robustify remote file syncing

[ml-evs]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.27%. Comparing base (cab4149) to head (8d3a4f9).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1078      +/-   ##
==========================================
+ Coverage   70.04%   70.27%   +0.22%     
==========================================
  Files          62       63       +1     
  Lines        3996     4124     +128     
==========================================
+ Hits         2799     2898      +99     
- Misses       1197     1226      +29     

Files with missing lines	Coverage Δ
pydatalab/src/pydatalab/remote_filesystems.py	81.50% <100.00%> (+1.75%)	⬆️
pydatalab/src/pydatalab/routes/v0_1/remotes.py	85.45% <100.00%> (+0.54%)	⬆️

... and 6 files with indirect coverage changes

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[cypress]

datalab    Run #3233

Run Properties:   Passed #3233  •  7fd8d7d6cf ℹ️: Merge 5d025add370e554c2369e1e725cc1f498c00b269 into bb599e488bb6574e0adc83b86152...

Project	datalab
Branch Review	ml-evs/remote-syncing
Run status	Passed #3233
Run duration	08m 33s
Commit	7fd8d7d6cf ℹ️: Merge 5d025add370e554c2369e1e725cc1f498c00b269 into bb599e488bb6574e0adc83b86152...
Committer	Matthew Evans
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	501
View all changes introduced in this branch ↗︎