GIT_SILENT: remove check about git

2 jobs for master in 50 minutes and 33 seconds (queued for 196 minutes and 59 seconds)
Status Job ID Name Coverage
  Build
passed #51441
build_clazy_clang_tidy

00:27:19

passed #51440
linux kf5-qt5 qt5.12

00:23:13

56.0%