Minor: Fix user details page bugs

[aniketkatkar97]

I worked on the following:

• [x] Fix the user avatar not showing any letter when the displayName is an empty string
• [x] Changed the patch request payload for displayName change to remove the displayName field if case of empty input instead of sending an empty string.

Before:

https://github.com/open-metadata/OpenMetadata/assets/51777795/09b96838-30ec-4d97-bc3e-272587f1f411

After:

https://github.com/open-metadata/OpenMetadata/assets/51777795/3fe8a0e2-826c-4ff1-9df1-045b74629dd4

Type of change:

• [x] Bug fix
• [x] Improvement

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My PR title is Fixes <issue-number>: <short explanation>
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[github-actions[bot]]

Jest test Coverage

UI tests summary

Lines	Statements	Branches	Functions
	65.22% (35327/54167)	42% (13974/33274)	44.01% (4338/9856)

[cypress[bot]]

Passing run #34525 ↗︎

0

541

421

0

0

Details:

Merge branch 'main' into fix-user-page-bug
Project: openmetadata	Commit: 2c4c315e60
Status: Passed	Duration: 26:33 💡
Started: Jun 27, 2024 7:11 AM	Ended: Jun 27, 2024 8:37 AM

Review all test suite changes for PR #16358 ↗︎

[aniketkatkar97]

@Sachin-chaurasiya I've pushed the changes. Can you please review it again?

[sonarqubecloud[bot]]

Quality Gate passed for 'open-metadata-ui'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud