Enable gene info panel e2e test for staging and prod

[tihuan]

Per this PR: https://github.com/chanzuckerberg/single-cell-explorer/pull/1151/files

The test is currently skipped due to gene info endpoint returning null in rdev. However, since the endpoint works for staging and prod, it might be valuable to enable the test for staging and prod

This will involve checking if the test is running in staging or prod to conditionally run the test!

[tihuan]

CC: @kaloster for visibility!

[tihuan]

Setting P1, since it's not mission critical but a nice to have for test coverage