Removes unused CSS Class from app/assets/stylesheets/performance_bar.scss

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What does this MR do and why?

Removes unused CSS Class

Removes Unused Classes from app/assets/stylesheets/performance_bar.scss

Classes removed are

• current-host
• css-truncate

Changelog : other

Closes : #481700 (closed)

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Related to #481700 (closed)

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