Add tooltip to display full github username for big repos

[SAN-MUYUN]

Summary:

Fixes #481

Type of change:

• ✨ New Feature/ Enhancement

Changes Made:

Before:

Users are not able to see the full github username of assignee from WATcher application.

After:

By hovering over the truncated username on the card header, users can now see the full github username of the corresponding assignee.

Screenshots:

On mouse hover, the full username of the corresponding user will be displayed via the tooltip.

Proposed Commit Message:

Add tooltip to display full github username for big repos

Checklist:

• I have tested my changes thoroughly.
• I have created tests for any new code files created in this PR or provided a link to a issue/PR that addresses this.
• I have added or modified code comments to improve code readability where necessary.
• I have updated the project's documentation as necessary.

[NorbertLoh]

It seems like there's a duplicate PR #488. However, you asked about it in #481. Perhaps you can discuss with each other. @SAN-MUYUN @lrongyi

[SAN-MUYUN]

@lrongyi Sorry that I didn't see your PR earlier on as I had already asked to work on this issue.
Our codes look very similar with just a minor difference in the getAssigneeTooltip method, will it be fine to let @NorbertLoh decide whose PR to be merged?

[lrongyi]

@SAN-MUYUN My bad as well, I should have double checked before I made the PR.
I'm fine with letting @NorbertLoh decide too.

[damithc]

@SAN-MUYUN Can you resolve the conflicts?

[SAN-MUYUN]

@damithc Hi prof, I have resolved the merge conflicts. However, this PR is very similar to a duplicated PR #486 which is already merged. Will it be fine for me to close this PR instead?

[damithc]

@damithc Hi prof, I have resolved the merge conflicts. However, this PR is very similar to a duplicated PR #486 which is already merged. Will it be fine for me to close this PR instead?

Sure @SAN-MUYUN, let's close this then.