[core] Moved test classes to own namespace Phing\Test\

[siad007]

No description provided.

[codecov]

Codecov Report

Merging #1565 (7d24cba) into main (2c83d50) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 7d24cba differs from pull request most recent head e481e85. Consider uploading reports for the commit e481e85 to get more accurate results

@@             Coverage Diff              @@
##               main    #1565      +/-   ##
============================================
- Coverage     55.97%   55.95%   -0.02%     
+ Complexity     6914     6911       -3     
============================================
  Files           355      354       -1     
  Lines         16742    16734       -8     
============================================
- Hits           9371     9364       -7     
+ Misses         7371     7370       -1     

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