Migrates .block-truncated to .gl-truncate

Sascha Eggenbergerrequested to merge
migrate-block-truncated-to-gl-truncate into master

What does this MR do and why?

Migrates block-truncated to gl-truncate and removes the custom CSS selector.

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Before After
block gl

How to set up and validate locally

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Related to #513105 (closed)

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