Use reflexive wording for self-assignment timeline events

[Copilot]

Issue timeline events show "Tyriar unassigned Tyriar" instead of "Tyriar removed their assignment" like GitHub.com does.

Changes

Modified AssignUnassignEventView in timeline.tsx to detect self-assignment/unassignment:

• When actor and assignee/unassignee are the same (single person): use reflexive wording
  • "assigned themselves" instead of "assigned {user}"
  • "removed their assignment" instead of "unassigned {user}"
• When different or multiple people: use standard wording

Example

// Before
"Tyriar unassigned Tyriar"
"Tyriar assigned Tyriar"

// After
"Tyriar removed their assignment"
"Tyriar assigned themselves"

The logic compares actor.login with assignees[0].login only when the array length is exactly 1, ensuring the reflexive form is used only for single-person self-operations.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Unassigning uses inconsistent wording to .com</issue_title> <issue_description>Testing microsoft/vscode-pull-request-github#6991

Should we align the wording?

</issue_description>

<agent_instructions>Add special wording like "removed their assignment" and "assigned themselves" for issue timeline assignment items where the actor and actee are the same.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes microsoft/vscode-pull-request-github#7005

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