Adding running bridges tests to phpunit.xml config

[msmakouz]

Q	A
Bugfix?	✔️
Breaks BC?	❌
New feature?	❌

What was changed

1. The phpunit.xml configuration file was missing configuration for bridge tests. Fixed.
2. The spiral/dotenv-bridge tests have been fixed; the bootloader no longer uses a callback.
3. Added InvokerStrategyInterface and InitializerInterface binding.
4. Abstract classes have been renamed from *Test to *TestCase.

Before these changes:

After these changes:

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +5.44% 🎉

Comparison is base (cc53ed1) 83.95% compared to head (a2334cf) 89.39%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #993      +/-   ##
============================================
+ Coverage     83.95%   89.39%   +5.44%     
  Complexity     6087     6087              
============================================
  Files           800      800              
  Lines         17141    17148       +7     
============================================
+ Hits          14390    15329     +939     
+ Misses         2751     1819     -932     

Files Changed	Coverage Δ
src/Bridge/Monolog/tests/HandlersTest.php	97.82% <ø> (+97.82%)	⬆️
src/Bridge/Monolog/tests/LoggerTest.php	86.66% <ø> (+86.66%)	⬆️
src/Bridge/Monolog/tests/ProcessorsTest.php	97.61% <ø> (+97.61%)	⬆️
src/Bridge/Monolog/tests/RotateHandlerTest.php	87.50% <ø> (+87.50%)	⬆️
src/Bridge/Monolog/tests/TraitTest.php	92.59% <ø> (+92.59%)	⬆️
src/Bridge/Stempler/tests/BaseTestCase.php	94.28% <ø> (ø)
src/Bridge/Stempler/tests/CacheTest.php	100.00% <ø> (+100.00%)	⬆️
src/Bridge/Stempler/tests/ConfigTest.php	100.00% <ø> (+100.00%)	⬆️
src/Bridge/Stempler/tests/DirectiveTest.php	100.00% <ø> (+100.00%)	⬆️
src/Bridge/Stempler/tests/EngineTest.php	100.00% <ø> (+100.00%)	⬆️
... and 5 more

... and 24 files with indirect coverage changes

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