Revert "Revert "[DRAFT] adds failing test for multiple provider scopes throwing ‘Only one tas…" (#3139)"

[rrousselGit]

This reverts commit e31a470.

[codecov]

Codecov Report

Merging #3140 (d1d3b22) into master (e31a470) will decrease coverage by 0.08%.
The diff coverage is 61.11%.

❗ Current head d1d3b22 differs from pull request most recent head 1522933. Consider uploading reports for the commit 1522933 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3140      +/-   ##
==========================================
- Coverage   95.14%   95.06%   -0.08%     
==========================================
  Files          53       53              
  Lines        2288     2292       +4     
==========================================
+ Hits         2177     2179       +2     
- Misses        111      113       +2     

Files	Coverage Δ
...kages/riverpod/lib/src/framework/auto_dispose.dart	100.00% <100.00%> (ø)
packages/riverpod/lib/src/framework/element.dart	98.23% <100.00%> (ø)
packages/riverpod/lib/src/framework/container.dart	96.91% <77.77%> (-0.84%)	⬇️
packages/riverpod/lib/src/framework/scheduler.dart	86.95% <28.57%> (-0.28%)	⬇️