Add Hostname resolution sections for Azure and GCP clouds

[afastronomer]

Issue Type

Missing content for an existing feature

Links to Affected Docs

https://www.astronomer.io/docs/astro/connect-gcp https://www.astronomer.io/docs/astro/connect-azure

The Issue or Context

Add Hostname resolution sections for Azure and GCP clouds. It will help customers to understand how can we help with private zones resolution.

Fix or Proposed Change

Create similar to AWS section.

Additional Notes

No response

Required Reviewers

No response