(e2e) Reduce Consistently time for catalogsource_ready metrics check (#2739)
(e2e) Reduce Consistently time for catalogsource_ready metrics check (#2739)

This test was checking for the catalogsource_ready metrics being emitted
with a particular value, consistently for a period of time. `Consistently`
blocks for the duration of time mentioned (previously 3m). Unfortunately,
there is no way to write an `Eventually` that starts polling after an
interval, which could have been the non-blocking alternatve to using
Consistently to perform the same check.

This PR reduces the period of time the test is blocked Consistently to
1m, to reduce the test package's overall runtime.

Ref:
https://onsi.github.io/gomega/#eventually
https://onsi.github.io/gomega/#consistently
Signed-off-by: Anik Bhattacharjee <947f381a9b7845b8ace0971d0e4d6ebd900b5e69@gmail.com>
operator-framework/operator-lifecycle-manager,operator-framework/operator-lifecycle-manager