Merge branch 'remove-unused-icons' into 'master'

Delete unused icons; add empty lines to svg files

See merge request !10415

app/views/shared/icons/_activity.svg

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app/views/shared/icons/_commits.svg

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app/views/shared/icons/_contributionanalytics.svg

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app/views/shared/icons/_delta.svg

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app/views/shared/icons/_files.svg

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app/views/shared/icons/_icon_play.svg

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app/views/shared/icons/_members.svg

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app/views/shared/icons/_milestones.svg

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app/views/shared/icons/_mr.svg

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app/views/shared/icons/_pipelines.svg

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