test: Only amend GitHub comments if result is not too long
test: Only amend GitHub comments if result is not too long

GitHub limits comments to 65536 characters.

Closes #4837
Reviewed-by: Dominik Perpeet <f7830b2723a5db4fc185058b06cfab4b89a38da9@redhat.com>

larsu/cockpit,michalskrivanek/cockpit,michalskrivanek/cockpit,mareklibra/cockpit,stefwalter/cockpit,deryni/cockpit,moraleslazaro/cockpit,stefwalter/cockpit,sgallagher/cockpit,dperpeet/cockpit,sgallagher/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,deryni/cockpit,deryni/cockpit,andreasn/cockpit,Scribery/cockpit,larskarlitski/cockpit,cockpituous/cockpit,garrett/cockpit,xhad/cockpit,stefwalter/cockpit,garrett/cockpit,larskarlitski/cockpit,mareklibra/cockpit,cockpituous/cockpit,mvollmer/cockpit,arilivigni/cockpit,arilivigni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,garrett/cockpit,larskarlitski/cockpit,stefwalter/cockpit,cockpit-project/cockpit,mvollmer/cockpit,andreasn/cockpit,andreasn/cockpit,michalskrivanek/cockpit,sgallagher/cockpit,moraleslazaro/cockpit,mareklibra/cockpit,sgallagher/cockpit,cockpit-project/cockpit,vanloswang/cockpit,petervo/cockpit,dperpeet/cockpit,vanloswang/cockpit,harishanand95/cockpit,mvollmer/cockpit,larsu/cockpit,andreasn/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,cockpituous/cockpit,mareklibra/cockpit,sgallagher/cockpit,cockpituous/cockpit,harishanand95/cockpit,larsu/cockpit,deryni/cockpit,martinpitt/cockpit,vanloswang/cockpit,harishanand95/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,larskarlitski/cockpit,vanloswang/cockpit,larsu/cockpit,dperpeet/cockpit,harishanand95/cockpit,sgallagher/cockpit,Scribery/cockpit,vanloswang/cockpit,SotolitoLabs/cockpit,larskarlitski/cockpit,Scribery/cockpit,cockpit-project/cockpit,mareklibra/cockpit,xhad/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,dperpeet/cockpit,SotolitoLabs/cockpit,Scribery/cockpit,martinpitt/cockpit,larsu/cockpit,petervo/cockpit,michalskrivanek/cockpit,xhad/cockpit,xhad/cockpit,michalskrivanek/cockpit,stefwalter/cockpit,andreasn/cockpit,xhad/cockpit,deryni/cockpit,dperpeet/cockpit,arilivigni/cockpit,xhad/cockpit,arilivigni/cockpit,SotolitoLabs/cockpit,martinpitt/cockpit,harishanand95/cockpit,mareklibra/cockpit,cockpituous/cockpit,larskarlitski/cockpit,dperpeet/cockpit,petervo/cockpit,Scribery/cockpit,Scribery/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,larsu/cockpit,martinpitt/cockpit,arilivigni/cockpit,dperpeet/cockpit,stefwalter/cockpit,andreasn/cockpit,xhad/cockpit,petervo/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,deryni/cockpit,michalskrivanek/cockpit,michalskrivanek/cockpit,petervo/cockpit,vanloswang/cockpit,petervo/cockpit,deryni/cockpit,Scribery/cockpit,arilivigni/cockpit,cockpit-project/cockpit,garrett/cockpit,vanloswang/cockpit,mareklibra/cockpit,harishanand95/cockpit,petervo/cockpit,sgallagher/cockpit,arilivigni/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit