ui test to search and choose a recipient (no need to send)

[tomholub]

Actually, before writing a ui test for anything more specific, we should have one purely for being able to type and choose any of the recipient suggestions - which should catch situation like the one that happened to me.

Originally posted by @tomholub in #716 (comment)

Test steps:

1. compose new message
2. search for a recipient by only entering a name, not full email. Make sure it's something that's in Google contacts of the test account
3. wait for recipient to show
4. click on the recipient, confirm it rendered as a green bubble

[fcvakintos]

@tomholub covered, could you check?
#797

[tomholub]

Could you please name the PRs a little better :-)