fix(devtools): add keys to mapped entries for Explorer

[Liam-Tait]

Added missing key prop to map fns on Explorer.tsx

Used entry.label as key, which assumes that label is unique

Discovered after converting Explorer component to typescript here

A way to avoid this issue in the future could be to enable eslint-plugin-react's react/jsx-key rule

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/tanstack/react-query/5o3s8G8g2XZntoZHApkwSy6Kb8fr
✅ Preview: https://react-query-git-fork-liam-tait-add-key-to-explo-b7c9f7-tanstack.vercel.app

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 28d0e02:

Sandbox	Source
tannerlinsley/react-query: basic	Configuration
tannerlinsley/react-query: basic-typescript	Configuration

[codecov]

Codecov Report

Merging #3446 (28d0e02) into master (5388160) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master    #3446   +/-   ##
=======================================
  Coverage   96.41%   96.41%           
=======================================
  Files          45       45           
  Lines        2286     2286           
  Branches      642      642           
=======================================
  Hits         2204     2204           
  Misses         79       79           
  Partials        3        3           

Impacted Files	Coverage Δ
src/devtools/Explorer.tsx	76.92% <50.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5388160...28d0e02. Read the comment docs.

[tannerlinsley]

🎉 This PR is included in version 3.34.19 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[tannerlinsley]

🎉 This PR is included in version 4.0.0-alpha.24 🎉

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

Your semantic-release bot 📦🚀