Use avatars instead of icons in activity view

• I originally added the icons for all events, regardless of whether they were in the activity view or the profile view
• Activity view is harder to read without avatars, so this MR puts them back, while keeping icons in activity view

Before	After

EE MR https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1632

assigned to @jschatz1

assigned to @DouweM

assigned to @annabeldunstone

added 2 commits

• d4c5dc49 - Only show icons on profile page; change to case statement
• 71b7461f - Reuse system notes helper for profile event icons

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resolved all discussions

added 1 commit

• 74609fa1 - Add helper for using avatars vs icons

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added 1 commit

• 466ca12e - Add helper for using avatars vs icons

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resolved all discussions

@DouweM can you please review again? EE MR: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/1632

assigned to @DouweM

@annabeldunstone 2 comments :)

assigned to @annabeldunstone

resolved all discussions

added 1 commit

• ec34efdc - Move event icons into events_helper

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@DouweM moved everything into events_helper. Can you review again?

added 1 commit

• 604d198e - Move event icons into events_helper

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added 1 commit

• 8552d120 - Move event icons into events_helper

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assigned to @DouweM

approved this merge request

enabled an automatic merge when the pipeline for 8552d120 succeeds

merged

mentioned in commit 3e19ecae

Picked into 9-1-stable, will go into 9.1.0-rc2

mentioned in commit 2979a84b