#6278 Add test for JCB credit card (length = 15 or 16)
#6278 Allow JCB credit card number to be 15 digits long
Remove static in dataProvider declaration
Add group issue annotation
#6927 #6278 - adding missing `@group` docblock referencing the pull request that introduced the test
#6927 #6278 - adding missing docblock
#6927 #6278 - adding missing docblock parameters, minor cs fixes
Merge branch 'hotfix/#6927-#6278-jcb-credit-card-validator-allowed-ranges-update'

Close #6927
Close #6278