Keyboard focus on owner list on package detail page

[lyndaidaii]

Summary of the changes (in less than 80 characters):

Before:

After:

Addresses: https://github.com/NuGet/Engineering/issues/4827

[joelverhagen]

Can you test this with a very long username? And a very long username containing a character like a hyphen?

[joelverhagen]

LGTM, I just wanted to make sure long usernames were tested.

[lyndaidaii]

LGTM, I just wanted to make sure long usernames were tested.

original doesn't work for long username. Put new changes. it looks like below if we would like to keep overflow hidden, otherwise it needs set overflow visible. It looks fine if we are ok to have wider right white space for long username.
any preference? personally, I think it's better to keep overflow hidden to avoid long username breaking UI. @joelverhagen, please let me know do you think.

[joelverhagen]

I don't think we should widen the panel. Hiding the overflow with ellipsis (this is previous behavior) is right.