Fix incorrect option when adding TaxType to item

[pierredup]

Fixes #981

[what-the-diff]

PR Summary

• Modification to ItemType.php
  In the ItemType.php file located in the src/QuoteBundle/Form/Type directory, there is an adjustment involving the removal of the 'class' => Tax::class, line. This impacts the TaxEntityType::class field options array.

• Introduction of ItemTypeTest.php
  A new testing file named ItemTypeTest.php has been added to src/QuoteBundle/Tests/Form/Type. This contains a test for the submission of a form which includes form data creation and verification of correct data form population.

• The testing of the Item object
  Additionally, an Item object is created with the same data to ensure the form data and Item object are identical.

• SetUp operations and registration
  Necessary setUp code is added as part of the testing process, which includes producing a currency object and registering the ItemType form with the form factory.

• New directory for test files
  This test file is placed in a newly created directory Tests/Form/Type.

[codecov]

Codecov Report

Attention: 45 lines in your changes are missing coverage. Please review.

Comparison is base (5d115d0) 50.97% compared to head (0a8722a) 50.79%.
Report is 28 commits behind head on 2.2.x.

Files	Patch %	Lines
...le/EventSubscriber/CronScheduleEventSubscriber.php	0.00%	35 Missing ⚠️
src/CoreBundle/Config/Loader/EnvLoader.php	63.63%	4 Missing ⚠️
src/CoreBundle/ConfigWriter.php	0.00%	1 Missing ⚠️
src/CoreBundle/Repository/VersionRepository.php	0.00%	1 Missing ⚠️
src/InstallBundle/Action/Install.php	0.00%	1 Missing ⚠️
src/InstallBundle/Command/InstallCommand.php	0.00%	1 Missing ⚠️
src/UserBundle/Email/ResetPasswordEmail.php	0.00%	1 Missing ⚠️
src/UserBundle/Repository/UserRepository.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              2.2.x     #982      +/-   ##
============================================
- Coverage     50.97%   50.79%   -0.18%     
- Complexity     2229     2240      +11     
============================================
  Files           442      443       +1     
  Lines          8295     8339      +44     
============================================
+ Hits           4228     4236       +8     
- Misses         4067     4103      +36     

Flag	Coverage Δ
unittests	50.79% <32.83%> (-0.18%)	⬇️

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