Plugin development environment should have proper field formats setup for index pattern

[aaronoah]

Describe the feature:
Kibana plugin development under kibana-extra folder should have proper index pattern setup during tests.
Describe a specific use case for the feature:
e.g. the test_utils/stub_index_pattern file that is required by some of the tests file should pre-register some dumb field formats to prevent the browser tests from failing.

[epixa]

Can you clarify the issue you'd like to address with this? I'm not really following what the problem is.

[aaronoah]

Sure. When a community vis plugin is being developed, we need to manually register dumb field formats for browser tests like this. Otherwise, the tests will fail because the default field formats in Kibana are not registered.