typescript: Add direct TLS negotiation support to TypeORM sample

**Is your feature request related to a problem? Please describe.**
TypeORM with PostgreSQL uses node-postgres, which doesn't currently support direct TLS negotiation. This prevents our TypeORM samples from benefiting from the performance improvements and better proxy compatibility offered by this PostgreSQL 17 feature.

**Describe the solution you'd like**
Once the upstream driver supports the feature, modify the sample to add support for the `sslnegotiation` connection parameter through TypeORM's connection options.

**Describe alternatives you've considered**
- None available.

**Additional context**
This feature was originally requested in #150 and has been broken out given many drivers already support this functionality.

Status upstream depends on node-postgres support, which can be tracked in #171.

Track node-postgres support through issue #171 before starting. Once that support is available, update the TypeORM sample's connection options to pass the PostgreSQL `sslnegotiation` parameter, then verify that the sample connects successfully using the new setting.

Written by the indexing model from the issue text.