fix: RejectedExecutionException on shutdown

[toddbaert]

• don't reset noop provider on ProviderRepository shutdown, not necessary anyway since we create a whole new ProviderRepository on shutdown
• updated related tests

@Kavindu-Dodan you were exactly right on the cause.

Fixes: #647

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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No Coverage information
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[codecov]

Codecov Report

Merging #652 (c62fd11) into main (b77e44e) will increase coverage by 0.32%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #652      +/-   ##
============================================
+ Coverage     94.45%   94.78%   +0.32%     
+ Complexity      360      358       -2     
============================================
  Files            32       32              
  Lines           848      843       -5     
  Branches         52       52              
============================================
- Hits            801      799       -2     
+ Misses           25       23       -2     
+ Partials         22       21       -1     

Flag	Coverage Δ
unittests	94.78% <ø> (+0.32%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...n/java/dev/openfeature/sdk/ProviderRepository.java	98.43% <ø> (+1.33%)	⬆️

... and 1 file with indirect coverage changes

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