Invoices: show only custom documents in upload form

[kevinpapst]

Description

See commits

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I verified that my code applies to the guidelines (composer kimai:code-check)
• I updated the documentation (see here)
• I agree that this code is used in Kimai and will be published under the MIT license

[codecov]

Codecov Report

Merging #1786 into master will decrease coverage by 0.06%.
The diff coverage is 78.26%.

@@             Coverage Diff              @@
##             master    #1786      +/-   ##
============================================
- Coverage     92.37%   92.30%   -0.07%     
- Complexity     4871     4892      +21     
============================================
  Files           450      450              
  Lines         15087    15136      +49     
============================================
+ Hits          13936    13971      +35     
- Misses         1151     1165      +14     

Impacted Files	Coverage Δ	Complexity Δ
src/Form/InvoiceDocumentUploadForm.php	54.16% <21.42%> (-45.84%)	7.00 <5.00> (+5.00)	⬇️
src/Controller/InvoiceController.php	79.21% <86.66%> (+0.11%)	51.00 <0.00> (ø)
src/Repository/InvoiceDocumentRepository.php	94.23% <94.44%> (-5.77%)	26.00 <18.00> (+15.00)	⬇️
src/DependencyInjection/Configuration.php	98.30% <100.00%> (+<0.01%)	30.00 <0.00> (ø)
src/Invoice/ServiceInvoice.php	87.57% <100.00%> (+0.14%)	68.00 <2.00> (+1.00)