Audit list of classes in page_bundles/milestone.scss

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What does this MR do and why?

Audit list of classes in page_bundles/milestone.scss removed below classes

• milestone-issues-list
• milestone-merge
• milestone-actions
• milestone-popover-instructions-list
• milestone-banner-text
• milestone-banner-link

fixes #481679

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Related to #481679

added devopsfoundations groupdesign system sectioncore platform typemaintenance labels

added pipelinetier-1 label

added Leading Organization label

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added Community contribution workflowin dev labels

assigned to @Deepak18-06

changed the description

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added Hackathon label

added linked-issue label

added Category:Design System label

Reviewer roulette

Category	Reviewer	Maintainer
frontend	@agulina (UTC+2)	@kushalpandya (UTC-4)
UX	@pedroms (UTC+1)	Maintainer review is optional for UX

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Generated by 🚫 Danger

@Deepak18-06, it seems we're waiting on an action from you for approximately two weeks.

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added automation:author-reminded label

added idle label

changed the description

@gitlab-bot label frontend

@gitlab-bot ready

added frontend label

removed idle label