Prevent Line Numbers in Diffusion being copied as Tabs

Summary: Marks Line Numbers in Diffusion File Preview as unselectable

Test Plan:

• Select multiple Lines from a File Preview in Diffusion
• Copy them into a Text Editor
• The Leading Tabs should no longer included

Reviewers: O1 Blessed Committers, speck, Ekubischta

Reviewed By: O1 Blessed Committers, speck, Ekubischta

Subscribers: Ekubischta, speck, tobiaswiese, valerio.bozzolan

Differential Revision: https://we.phorge.it/D25024