fix(collector): Let pgx library parse TLS parameters

[banjoh]

Description, Motivation and Context

This allows the collector to respect the sslmode parameters

Reviewer notes
For the postgres collector, we let pgx library parse TLS parameters via its ParseConfig function instead of the collector's default implementation of construction a tls.Config instance for secure connections. pgx respects the sslmode parameters when constructing a tls.Config instance. Troubleshoot does not need to do this.

We drop the TLS param files to a file and pass them to the library as environment variables, then cleanup after ourselves.

Fix: #1163

Checklist

• New and existing tests pass locally with introduced changes.
• Tests for the changes have been added (for bug fixes / features)
• The commit message(s) are informative and highlight any breaking changes
• Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here

Does this PR introduce a breaking change?

• Yes
• No

[CpuID]

LGTM, and tests pass, approved