tests/CodingStyleTest: no need to install erp5_administration

now BusinessTemplate_getPythonSourceCodeMessageList is in erp5_core
7 jobs for feat/coding_style_light_install in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-TestRunner1

01:44:17

passed ERP5.PerformanceTest-TestRunner1

00:32:06

failed ERP5.UnitTest-TestRunner1

04:17:29

failed ERP5.PerformanceTest-TestRunner1

00:32:40

canceled ERP5.PerformanceTest-TestRunner1

failed ERP5.UnitTest-TestRunner1

04:45:59

canceled ERP5.UnitTest-TestRunner1