fix: keep repeated extended query params as arrays beyond 20 values

[wwenrr]

Summary

• fix extended query parser behavior for repeated keys with >20 values
• set arrayLimit: 1000 in parseExtendedQueryString so repeated key form (a=1&a=2...) keeps returning arrays
• add regression test for 21 repeated tenancyIds values

Why

Issue #7147 reports that in 4.22.x repeated query keys switch from array to object once count exceeds 20, which is a behavior break for existing apps.

Testing

• ran test suite in Docker (node:22)
• validated req.query extended parser test including new regression case