[UnifiedDocViewer] Remove large string truncation

[lio-p]

Kibana version: 7.6.1

Elasticsearch version: 7.6.1

Browser version: Chrome 80.0.3987.163

Browser OS version: macOS Mojave

Original install method (e.g. download page, yum, from source, etc.): Elasticsearch Service

Describe the bug:

In a Saved search (Discover or integrated in a Dashboard), long text, in the table view, does not get wrap as the window get resized past a certain minimum threshold.

This minimum threshold depends on the number of columns selected in the saved search. If there is a only a few columns selected, the screen can get resized to very small size before truncating the text which is fine. This behavior become an issue when there are many columns selected, above 10 column and/or the column name are long as they take more horizontal space. In this case, the horizontal resize is very limited as the text gets truncated early on.

Steps to reproduce:

1. Create an index with sample documents that contains many attributes (long attribute name helps). At least one attribute that contains a large text.
2. Create an index pattern that points to this index.
3. In Discover, toggle many columns, expand the document and try to resize horizontally. Up to a point, the large text is being wrapped until it gets truncated.

Expected behavior:

I would expect the text in the expanded view to not be truncated.

Screenshots (if relevant):

[elasticmachine]

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