[ML] Filter icons in anomaly charts rendered out of visible view

** Items to be completed **

• ensure values (even long values) are always rendered within the visible area

Kibana version: latest

Describe the bug:

For anomaly charts in the explorer and in dashboard, the filter icons can sometimes be rendered out of the visible area when the field names/values are long.

Expected behavior:

The field names/values should be truncated to ensure the filter icons always show up. A tooltip can be added as a way for users to view the full field name/value.

Screenshots (if relevant):