feat: Add backend support for CONTAINS operator in workflow visibility queries to enable substring matching.

[ArchishmanSengupta]

What changed?

Add CONTAINS operator support for substring matching in workflow visibility queries.

Files modified:

• common/persistence/visibility/store/sql/query_converter.go + tests
• common/persistence/visibility/store/elasticsearch/converter.go
• common/persistence/visibility/store/query/converter.go
• go.mod (replace directive for local sqlparser)

Query transformation:

WorkflowId CONTAINS "substring" 
→ SQL: LIKE '%substring%' ESCAPE '!'
→ ES: WildcardQuery("*substring*")

Related PRs: sqlparser ([link]) and UI ([link]) - all three must merge together.

Why?

Enable substring search for WorkflowId/WorkflowType. Currently only prefix matching (STARTS_WITH) is available.

Example use case: Find workflows containing "user-service" anywhere in the name:

• ai-agent-user-service-1 ✓
• api-user-service-sync ✓
• backend-payment-service ✗

How did you test it?

• built
• run locally and tested manually
• covered by existing tests
• added new unit test(s) (5 test cases)

Manual testing: Created test workflows, verified CONTAINS query returns correct results via CLI and UI.

Potential risks

Performance: LIKE '%value%' cannot use indexes (leading wildcard). May be slower on large datasets. Mitigate by combining with other filters (timerange, status).

Dependencies: Requires sqlparser PR merged first. Remove replace directive in go.mod before merging.

Related PRs: sqlparser ([link]) and UI ([link]) - all three must merge together.