[Lens] Long field name on field stats panel doesn't wrap/clip

[markov00]

Kibana version:
7.12
Browser version:
chrome
Browser OS version:
macOS
Original install method (e.g. download page, yum, from source, etc.):
cloud
Describe the bug:
When a very long field name, as in the screenshot, is not correctly wrapped to a new line or clipped when showing the stats panel for that field
Steps to reproduce:

1. create a set of logs with makelogs or add a scripted field to an index with a very long field name with no spaces
2. open lens, click on that field to show the statistics panel
3. see the screenshot

Expected behavior:
The field name should be wrapped to a new line

Screenshots (if relevant):

Errors in browser console (if relevant):
n/a

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)

[flash1293]

Same happens in Discover, we can probably fix the same way: