Fix local replicated_partition_exports table might miss entries

[arthurpassos]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

The system.replicated_partition_exports table has two modes: remote and local. This is controlled by export_merge_tree_partition_system_table_prefer_remote_information. The idea is to avoid querying zookeeper whenever possible. The local mode relies purely on the in-memory list of tasks. This PR fixes a possibly rare issue when a task is created and set to a non pending state (e.g, killed or completed) before a given replica can fetch it. In that case, the entry would never exist locally and would not show up.

Documentation entry for user-facing changes

...

CI/CD Options

Exclude tests:

• Fast test
• Integration Tests
• Stateless tests
• Stateful tests
• Performance tests
• All with ASAN
• All with TSAN
• All with MSAN
• All with UBSAN
• All with Coverage
• All with Aarch64
• All Regression
• Disable CI Cache

Regression jobs to run:

• Fast suites (mostly <1h)
• Aggregate Functions (2h)
• Alter (1.5h)
• Benchmark (30m)
• ClickHouse Keeper (1h)
• Iceberg (2h)
• LDAP (1h)
• Parquet (1.5h)
• RBAC (1.5h)
• SSL Server (1h)
• S3 (2h)
• Tiered Storage (2h)

[arthurpassos]

Related to #1498

cc @Selfeer

[github-actions]

Workflow [PR], commit [43bc8bf]

[Selfeer]

PR #1500 Audit Review

AI audit note: This review was generated by AI (gpt-5.3-codex).

Audit update for PR #1500 (fix local replicated_partition_exports table possibly missing non-PENDING entries)

---

Confirmed defects

No confirmed defects in reviewed scope.

[Selfeer]

Added test into clickhouse-regression for this: https://github.com/Altinity/clickhouse-regression/blob/main/s3/tests/export_partition/sanity.py

The tests pass no additional issues are present.

Passing

✔ [ OK ] '/s3/minio/export tests/export partition/sanity/replicated partition exports local mode peer replica' (3s 526ms)
✔ [ OK ] '/s3/minio/export tests/export partition/sanity' (3s 530ms)
✔ [ OK ] '/s3/minio/export tests/export partition' (49s 908ms)
✔ [ OK ] '/s3/minio/export tests' (49s 926ms)
✔ [ OK ] '/s3/minio' (1m 42s)
✔ [ OK ] '/s3' (1m 42s)