dev/sg: fix enterprise-e2e set, fix frontend-e2e test preamble
requested to merge 07-06-dev/sg_fix_enterprise-e2e_set_fix_frontend-e2e_test_preamble into 07-06-dev/sg_add_envOverrides_option_for_sets_to_override_command_env
Created by: bobheadxi
Fixes enterprise-e2e run set using envOverrides introduced in https://github.com/sourcegraph/sourcegraph/pull/38318 , and updates the frontend-e2e test preamble + db reset instructions
Test plan
sg start enterprise-e2e
sg test frontend-e2e