fix(e2e): fix flaky DataContracts owner assignment crashing on undefined displayName

[shrabantipaul-collate]

Describe your changes:

Issue

user.responseData.displayName is undefined at runtime (signup API doesn't auto-populate it), causing waitForResponse to wait for q=undefined — a URL that never fires. The test times out, the page closes, and Playwright throws "Target page, context or browser has been closed".

Fix

Use user.getUserDisplayName() which already falls back to responseData.name when displayName is absent.
Fixes

I worked on ... because ...

Type of change:

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Checklist:

• 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.

[gitar-bot]

Code Review ✅ Approved

Adds a null-coalescing check for displayName when assigning DataContracts owners, resolving the root cause of flaky E2E test crashes. No issues found.

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[github-actions]

Jest test Coverage

UI tests summary

Lines	Statements	Branches	Functions
	61.98% (60411/97454)	42.02% (31688/75403)	45.02% (9506/21111)

[sonarqubecloud]

Quality Gate passed for 'open-metadata-ui'

Issues
1023 New issues
0 Accepted issues

Measures
15 Security Hotspots
0.0% Coverage on New Code
3.8% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🟡 Playwright Results — all passed (9 flaky)

✅ 3702 passed · ❌ 0 failed · 🟡 9 flaky · ⏭️ 89 skipped

Shard	Passed	Failed	Flaky	Skipped
✅ Shard 1	481	0	0	4
🟡 Shard 2	655	0	1	7
✅ Shard 3	666	0	0	1
🟡 Shard 4	646	0	2	27
🟡 Shard 5	610	0	1	42
🟡 Shard 6	644	0	5	8

🟡 9 flaky test(s) (passed on retry)

• Features/BulkEditEntity.spec.ts › Glossary (shard 2, 1 retry)
• Pages/Customproperties-part2.spec.ts › entityReferenceList shows item count, scrollable list, no expand toggle (shard 4, 1 retry)
• Pages/DataInsightReportApplication.spec.ts › Uninstall application (shard 4, 1 retry)
• Pages/Glossary.spec.ts › Add and Remove Assets (shard 5, 1 retry)
• Features/AutoPilot.spec.ts › Agents created by AutoPilot should be deleted (shard 6, 1 retry)
• Pages/HyperlinkCustomProperty.spec.ts › should display URL when no display text is provided (shard 6, 1 retry)
• Pages/Lineage/LineageFilters.spec.ts › Verify lineage schema filter selection (shard 6, 1 retry)
• Pages/Lineage/LineageRightPanel.spec.ts › Verify custom properties tab IS visible for supported type: searchIndex (shard 6, 1 retry)
• Pages/Users.spec.ts › Permissions for table details page for Data Consumer (shard 6, 1 retry)

📦 Download artifacts

How to debug locally

# Download playwright-test-results-<shard> artifact and unzip
npx playwright show-trace path/to/trace.zip    # view trace