Remove fetch caching

[kmcginnes]

Issue #, if available: N/A

Description of changes

• Removed local fetch caching logic
• Removed fetch caching configuration in connection

Context

When the change was made to use POST for database queries (PR #206), it completely broke the local fetch caching that existed before. This makes the caching logic and configuration irrelevant and essentially dead code.

If we desire client side caching for network calls, we should lean on React Query caching, which is already being used by Graph Explorer in some ways. Removing the custom client side caching makes this transition simpler when it comes time.

Disclaimer

Important

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 12.19%. Comparing base (2744e93) to head (5c5b960).
Report is 3 commits behind head on main.

Files	Patch %	Lines
...ackages/graph-explorer/src/connector/useGEFetch.ts	0.00%	26 Missing ⚠️
...es/graph-explorer/src/connector/utils/anySignal.ts	0.00%	13 Missing ⚠️
...graph-explorer/src/connector/gremlin/useGremlin.ts	0.00%	2 Missing ⚠️
...explorer/src/connector/openCypher/useOpenCypher.ts	0.00%	2 Missing ⚠️
...s/graph-explorer/src/connector/sparql/useSPARQL.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   12.15%   12.19%   +0.03%     
==========================================
  Files         411      411              
  Lines       30575    30458     -117     
  Branches      776      777       +1     
==========================================
- Hits         3717     3713       -4     
+ Misses      26525    26412     -113     
  Partials      333      333              

Flag	Coverage Δ
unittests	12.19% <0.00%> (+0.03%)	⬆️

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[kmcginnes]

Rebased on main and fixed conflicts

[vkagamlyk]

LGTM

[michaelnchin]

Thanks @kmcginnes !

Minor note, let's also remove the connection cache section from the README:
https://github.com/aws/graph-explorer?tab=readme-ov-file#connection-cache

[kmcginnes]

@michaelnchin Good catch! I've removed that section. Should be good now.