test(react-query-devtools): add test case for not in process.env.NODE_ENV='development'

[manudeli]

not In process.env.NODE_ENV='development', ReactDevTools of @tanstack/react-query-devtools should be return null.
so I added test case for it.

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Latest deployment of this branch, based on commit 6263ec7:

Sandbox	Source
@tanstack/query-example-angular-basic	Configuration
@tanstack/query-example-react-basic-typescript	Configuration
@tanstack/query-example-solid-basic-typescript	Configuration
@tanstack/query-example-svelte-basic	Configuration
@tanstack/query-example-vue-basic	Configuration

[codecov-commenter]

Codecov Report

Merging #6940 (8c92a5b) into main (d572279) will increase coverage by 0.04%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6940      +/-   ##
==========================================
+ Coverage   41.29%   41.33%   +0.04%     
==========================================
  Files         180      180              
  Lines        7193     7193              
  Branches     1454     1454              
==========================================
+ Hits         2970     2973       +3     
+ Misses       3836     3834       -2     
+ Partials      387      386       -1     

Components	Coverage Δ
@tanstack/angular-query-devtools-experimental	∅ <ø> (∅)
@tanstack/angular-query-experimental	82.29% <ø> (ø)
@tanstack/eslint-plugin-query	85.11% <ø> (ø)
@tanstack/query-async-storage-persister	48.43% <ø> (ø)
@tanstack/query-broadcast-client-experimental	∅ <ø> (∅)
@tanstack/query-codemods	0.00% <ø> (ø)
@tanstack/query-core	93.63% <ø> (ø)
@tanstack/query-devtools	4.09% <ø> (ø)
@tanstack/query-persist-client-core	57.73% <ø> (ø)
@tanstack/query-sync-storage-persister	82.50% <ø> (ø)
@tanstack/react-query	93.07% <ø> (ø)
@tanstack/react-query-devtools	10.71% <ø> (+10.71%)	⬆️
@tanstack/react-query-next-experimental	∅ <ø> (∅)
@tanstack/react-query-persist-client	100.00% <ø> (ø)
@tanstack/solid-query	84.84% <ø> (ø)
@tanstack/solid-query-devtools	∅ <ø> (∅)
@tanstack/solid-query-persist-client	100.00% <ø> (ø)
@tanstack/svelte-query	62.68% <ø> (ø)
@tanstack/svelte-query-devtools	∅ <ø> (∅)
@tanstack/svelte-query-persist-client	100.00% <ø> (ø)
@tanstack/vue-query	70.81% <ø> (ø)
@tanstack/vue-query-devtools	∅ <ø> (∅)