deploy: feat(tool/Postgresql): Set default host and port for Postgresql source (googleapis#1927)

### Description

This pull request addresses issue #41 by implementing default connection
values for the Postgresql data source. When a user does not specify a
host or port, the connection will now automatically default to
`localhost:5432`.

---

### Detailed Changes

- **docs/en/reference/prebuilt-tools.md**
   -updated the env variables host and port to optional in the doc

- **internal/prebuiltconfigs/tools/postgres.yaml**
- Added the default values to host and port. Specifically, they are now
`host: ${POSTGRES_HOST:localhost}` and `port: ${POSTGRES_PORT:5432}`.
This allows the configuration loader to directly use `"localhost"` or
`"5432"` as a fallback if the `POSTGRES_HOST` or `POSTGRES_PORT`
environment variables are not set.

---

### PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there
are a few things you can do to make sure it goes smoothly:

- [ ] Make sure you reviewed
  CONTRIBUTING.md
- [ ] Make sure to open an issue as a
  bug/issue
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change

🛠️ **Fixes** #41

---------

Co-authored-by: Averi Kitsch <akitsch@google.com> 7e6e88a

Author: pull[bot]

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