chore: remove tabs from ServicesPage
chore: remove tabs from ServicesPage

while upgrading typescript, it complains about some instance-props not being
set. looking at those props it turns out we have a full tab-handling mechanism
here we don't seem to use. so we say goodbye to it as well as the UNSAFE_*-calls
it brought along the way! :tada:

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui