Fix plugins cache

[kaixi-wang]

What changes are proposed in this pull request?

(Please fill in changes proposed in this fix)

How is this patch tested? If it is not, please explain why.

(Details)

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

(Details in 1-2 sentences. You can just refer to another PR with a description
if this PR is part of a larger change.)

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[ritch]

Can you add a test? Need to test plugins at a few levels as they can be grouped in a dir or at the root.

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (146059f) 16.23% compared to head (09fc555) 16.23%.
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3729      +/-   ##
===========================================
- Coverage    16.23%   16.23%   -0.01%     
===========================================
  Files          640      640              
  Lines        74260    74254       -6     
  Branches       988      988              
===========================================
- Hits         12058    12052       -6     
  Misses       62202    62202              

Flag	Coverage Δ
app	16.23% <64.10%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...pp/packages/relay/src/fragments/datasetFragment.ts	100.00% <100.00%> (ø)
app/packages/state/src/recoil/groups.ts	59.34% <100.00%> (-0.66%)	⬇️
app/packages/state/src/recoil/selectors.ts	51.14% <100.00%> (ø)
app/packages/state/src/recoil/types.ts	100.00% <100.00%> (ø)
...es/core/src/components/Actions/similar/Similar.tsx	0.00% <0.00%> (ø)
...kages/core/src/components/Actions/similar/utils.ts	0.00% <0.00%> (ø)
...pp/packages/app/src/pages/datasets/DatasetPage.tsx	0.00% <0.00%> (ø)
...ore/src/components/Actions/similar/GroupButton.tsx	0.00% <0.00%> (ø)
app/packages/state/src/recoil/utils.ts	68.39% <27.27%> (ø)

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