Limit member tribute autocomplete to 10
What does this MR do?
We currently use atjs for @ autocompletion, and we are in the process of migrating to tribute behind the feature flag :tribute_autocomplete since atjs is jQuery-based and deprecated. The migration is tracked in &4002.
When the tribute_autocomplete feature flag is switched on, we show all members in the @ autocomplete menu but since each menu item contains an 
avatar, a large number of fetches are done to get all these avatars. This commit limits the number of members listed in the autocomplete menu to avoid doing a large number of fetches.
Screenshots (strongly suggested)
| before | after |
|---|---|
| Screen_Recording_2021-01-08_at_1.52.38_pm | Screen_Recording_2021-01-08_at_1.55.40_pm |
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation (if required) -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Availability and Testing
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Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. -
Tested in all supported browsers -
Informed Infrastructure department of a default or new setting change, if applicable per definition of done
Security
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
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Label as security and @ mention @gitlab-com/gl-security/appsec -
The MR includes necessary changes to maintain consistency between UI, API, email, or other methods -
Security reports checked/validated by a reviewer from the AppSec team
Edited by Coung Ngo