Refactor(utils): Ensure consistent declaration style of utility functions and standardize parameters for the sleep method

[Lennon57]

I noticed that most functions within the packages/*/src/utils.ts and packages/*/src/__tests__/utils.ts files were declared as regular functions, so I made consistent adjustments.
While most were already in this format, I found a few arrow functions and updated them accordingly (It doesn't seem to be using the 'this").
Additionally, I noticed inconsistency in the parameters of the sleep function, where some used timeout while others used ms, so I unified them all to ms.

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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

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.25%. Comparing base (96a743e) to head (87306cb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #7554       +/-   ##
===========================================
+ Coverage   43.87%   62.25%   +18.38%     
===========================================
  Files         184      124       -60     
  Lines        7027     4478     -2549     
  Branches     1534     1233      -301     
===========================================
- Hits         3083     2788      -295     
+ Misses       3578     1459     -2119     
+ Partials      366      231      -135     

Components	Coverage Δ
@tanstack/angular-query-devtools-experimental	∅ <ø> (∅)
@tanstack/angular-query-experimental	86.58% <ø> (ø)
@tanstack/eslint-plugin-query	∅ <ø> (∅)
@tanstack/query-async-storage-persister	43.85% <ø> (ø)
@tanstack/query-broadcast-client-experimental	∅ <ø> (∅)
@tanstack/query-codemods	∅ <ø> (∅)
@tanstack/query-core	92.78% <100.00%> (-0.01%)	⬇️
@tanstack/query-devtools	5.24% <ø> (ø)
@tanstack/query-persist-client-core	57.73% <ø> (ø)
@tanstack/query-sync-storage-persister	82.50% <ø> (ø)
@tanstack/react-query	92.72% <ø> (ø)
@tanstack/react-query-devtools	10.71% <ø> (ø)
@tanstack/react-query-next-experimental	∅ <ø> (∅)
@tanstack/react-query-persist-client	100.00% <ø> (ø)
@tanstack/solid-query	78.06% <ø> (ø)
@tanstack/solid-query-devtools	∅ <ø> (∅)
@tanstack/solid-query-persist-client	100.00% <ø> (ø)
@tanstack/svelte-query	68.66% <ø> (ø)
@tanstack/svelte-query-devtools	∅ <ø> (∅)
@tanstack/svelte-query-persist-client	100.00% <ø> (ø)
@tanstack/vue-query	70.60% <ø> (ø)
@tanstack/vue-query-devtools	∅ <ø> (∅)