Revert "bots: Run welder-web tests with chrome and firefox scenarios"
Revert "bots: Run welder-web tests with chrome and firefox scenarios"

This causes a regression when the test gets triggered as external
project from a cockpit bot PR:

    # VM running cockpit, composer, and end to end test container
    bots/image-customize -v \
    	-i `pwd`/cockpit-composer-*.noarch.rpm -i gcc-c++ \
    	-s /build/cockpit/test/vm.install \
    	rhel-7-6/chrome
    image-download: image link does not exist: chrome

Also, chrome tests currently have some failures, so let's get them fixed first.

This reverts commit caf897157b9ca193907ce302c260e94dcc5b430d.

Closes #10197

andreasn/cockpit,deryni/cockpit,mvollmer/cockpit,martinpitt/cockpit,garrett/cockpit,moraleslazaro/cockpit,garrett/cockpit,deryni/cockpit,andreasn/cockpit,cockpit-project/cockpit,martinpitt/cockpit,andreasn/cockpit,cockpituous/cockpit,andreasn/cockpit,andreasn/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,andreasn/cockpit,martinpitt/cockpit,cockpit-project/cockpit,garrett/cockpit,andreasn/cockpit,cockpituous/cockpit,deryni/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpit-project/cockpit,mvollmer/cockpit,garrett/cockpit,cockpituous/cockpit,deryni/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,martinpitt/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,deryni/cockpit,mvollmer/cockpit,moraleslazaro/cockpit,deryni/cockpit