Redact project bot name in UI

What does this MR do and why?

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Note: needs rebase after !81843 (merged) and !81472 (merged)

If the current user cannot read the project or group that the bot belongs to, redact bot name in the UI.

Before:

Not signed in:

Signed in as a group member:

After:

Not signed in:

Signed in a a group member:

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app/assets/javascripts/issuable/components/issue_assignees.vue

@@ -91,7 +91,7 @@ export default {
       data-qa-selector="assignee_link"
     >
       <span class="js-assignee-tooltip">
-        <span class="bold d-block">{{ s__('Label|Assignee') }}</span> {{ assignee.name }}
+        <span class="bold d-block">{{ s__('Label|Assignee') }}</span> {{ "TEST" }}
         <span v-if="assignee.username" class="text-white-50">@{{ assignee.username }}</span>
       </span>
     </user-avatar-link>