docs: Document automated release process

[jackfrancis]

Reason for Change:

This PR updates the release documentation to reflect that the release process is fully automated.

We also add more "no egress" coverage to the first phase in the automation.

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• No
• Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• No
• Yes

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

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