Fixes long commit messages overflow viewport in file tree

Merged Filipa Lacerda requested to merge 22544-long-commit-message into master

What does this MR do?

Fixes long commit messages breaking the table. It adds back a max-width in pixels instead of %.

Are there points in the code the reviewer needs to double check?

No.

Why was this MR needed?

To fix the overflow of the commit message

Screenshots (if relevant)

max_width

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Fixes #22544 (closed)

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