fix: dataset counts are displayed incorrectly in dataset pane

[keiya01]

Overview

closes reearth/reearth-visualizer#267

This PR is related to reearth/reearth-backend#154.

What I've done

• I fixed to use DatasetSchema's totalCount that is added in feat: add totalCount field to DatasetSchema type of GraphQL schema reearth-backend#154 in DataSourcePane.

What I haven't done

How I tested

1. run reearth-backend and reearth-web
2. add dataset
3. check dataset count

Screenshot

Which point I want you to review particularly

Memo

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[codecov]

Codecov Report

Merging #235 (6c5dde7) into main (fc97324) will decrease coverage by 0.13%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
- Coverage   51.62%   51.48%   -0.14%     
==========================================
  Files          58       58              
  Lines        1170     1175       +5     
  Branches      184      184              
==========================================
+ Hits          604      605       +1     
- Misses        502      506       +4     
  Partials       64       64              

Impacted Files	Coverage Δ
src/gql/graphql-client-api.tsx	35.62% <20.00%> (-0.21%)	⬇️

[rot1024]

OK for me, but wait merging until reearth/reearth-backend#154 has been merged