Stabilize the flaky Control Center and agentgateway e2e specs (#788)
Three separate causes behind the recent e2e failures.
The group view ranked every group in the account by peer count to decide what
to display, so with two workers it could land on a group another spec had just
created. openGroupView() selects the group by name instead.
Management now checks a provider's upstream URL when the provider is saved and
rejects it unless the URL returns a model list, so the agentgateway spec's
placeholder host stopped working. The test environment runs a stub that answers
the check.
The Backspace test blurred the group panel's search input before that input had
taken focus, so it reclaimed focus and swallowed the key.
Maycon Santos
fe32179dc1