Fix missing ER_DIAGRAM tab in Table and Database Schema customizePage Test

[shrabantipaul-collate]

Describe your changes:

• The Task redesign PR 25894 removed the ER_DIAGRAM tab from TABLE_DEFAULT_TABS and DATABASE_SCHEMA_DEFAULT_TABS in the playwright test constants.
• As a result in AUT, the Collate UI still renders ER_DIAGRAM tab, but the test constants count don't expect it, causing the toHaveCount assertion to fail.
• Restored the process.env.PLAYWRIGHT_IS_OSS conditional so OSS builds don't have the ER_DIAGRAM tab and Collate builds have it, matching what each environment actually renders.

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

Restores the missing ER_DIAGRAM tab within the Table and Database Schema customizePage tests. No issues found.

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[github-actions]

Jest test Coverage

UI tests summary

Lines	Statements	Branches	Functions
	62.06% (62310/100391)	42.25% (33402/79049)	45.3% (9904/21862)

[sonarqubecloud]

Quality Gate passed for 'open-metadata-ui'

Issues
1072 New issues
0 Accepted issues

Measures
17 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 (13 flaky)

✅ 3985 passed · ❌ 0 failed · 🟡 13 flaky · ⏭️ 86 skipped

Shard	Passed	Failed	Flaky	Skipped
✅ Shard 1	299	0	0	4
🟡 Shard 2	751	0	3	8
🟡 Shard 3	744	0	2	7
🟡 Shard 4	771	0	4	18
🟡 Shard 5	686	0	1	41
🟡 Shard 6	734	0	3	8

🟡 13 flaky test(s) (passed on retry)

• Features/ActivityAPI.spec.ts › Activity event is created when description is updated (shard 2, 1 retry)
• Features/ActivityAPI.spec.ts › Activity event shows the actor who made the change (shard 2, 1 retry)
• Features/Glossary/GlossaryHierarchy.spec.ts › should cancel move operation (shard 2, 1 retry)
• Features/RTL.spec.ts › Verify Following widget functionality (shard 3, 1 retry)
• Features/UserProfileOnlineStatus.spec.ts › Should not show online status for inactive users (shard 3, 1 retry)
• Pages/CustomProperties.spec.ts › Should display custom properties for chart in right panel (shard 4, 1 retry)
• Pages/DataContracts.spec.ts › Create Data Contract and validate for Topic (shard 4, 1 retry)
• Pages/DomainUIInteractions.spec.ts › Clear domain selection returns to All Domains (shard 4, 1 retry)
• Pages/Entity.spec.ts › Announcement create, edit & delete (shard 4, 1 retry)
• Pages/Entity.spec.ts › Tier Add, Update and Remove (shard 5, 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 › Check permissions for Data Steward (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