cherry-pick(1.12.7): fix(csv): correct entityType in recursive import extension validation + row-count accounting (#27593)

[yan-3005]

Summary

Cherry-pick of #27593 (commit 4930b105) to 1.12.7.

• Wrong entityType in extension validation: All rows in a recursive import were validated against the top-level entityType (e.g. database), so custom properties registered on table triggered false "Unknown custom field" errors. Added rowEntityType field on EntityCsv set per-row in DatabaseServiceRepository, DatabaseRepository, and DatabaseSchemaRepository.
• Row-count accounting bugs: Header row was counted as a processed/passed row; getRecordNumber() is 1-indexed including the header, so subtract 1 from all processed counts. Multiple field failures on one row incremented numberOfRowsFailed once per field — added countedFailureRecords Set to deduplicate.
• Empty extension token on export: CsvUtil.addExtension now filters entries whose formatted value is blank so null/empty-list custom properties are never written as bare key: tokens in exported CSVs.
• UI grid regression for all-fail imports: BulkEntityImportPage no longer routes FAILURE back to the upload step when rows were processed — only short-circuits for aborted or failure with processed=0 (malformed CSV).

Conflict resolution notes

• EntityCsvTest.java: took 1.12.7 base (6 tests) + applied only the 3 count-change lines from 4930b105; new tests from main require infrastructure not present in 1.12.7.
• DatabaseServiceResourceIT.java: took 1.12.7 base + added only test_recursiveImportCustomPropertyExtension; removed getVersionHistoryPaginated/getVersionHistoryWithFieldChanged overrides that reference SDK overloads not present in 1.12.7.
• GlossaryImportExport.spec.ts: kept 1.12.7 assertion style, applied corrected row counts.
• EntityCsv.java / other Java: resolved by merging 1.12.7 throws IOException declarations with main's new logic.

Test plan

• mvn -pl openmetadata-service test -Dtest=CsvUtilTest,EntityCsvTest -DskipSwagger=true — CsvUtilTest all pass; EntityCsvTest 3 count-change assertions pass (4 pre-existing RuleEngine init failures on 1.12.7 unrelated to this PR)
• mvn test-compile -pl openmetadata-integration-tests -DskipSwagger=true — clean compile
• Playwright GlossaryImportExport.spec.ts — validated locally, "Import validation - missing required fields" passes with rebuilt backend

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
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[gitar-bot]

Code Review ✅ Approved

Backports the fix for CSV recursive import validation and row-count accounting to the 1.12.7 release branch. No issues found.

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