New icons for issues and merge requests

Changed file icons (Merge request)

Note that the new icons shown below are intended to be colored. But they are just shown black and white because they are svgs. CSS will change them to the right color.

	Current	New
New file
Removed file
Modified file

Issue / Merge request status icons (Mobile)

	Current	New
Open
Close(Merge request)
Close(Issue)
Merged(MR)

Where to get SVGs

SVG Sprite : https://gitlab.com/gitlab-org/gitlab-svgs

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Related link: Sub-issue from #32894 (closed)

Out of scope

Pipeline manual actions

	Icon
Cancel
Play
Retry
Stop