Fix publish workflow fetch depth calculation (PP-3299)

[tdilauro]

Description

Inverts the condition and results of a the fetch depth calculation in the publish workflow so that a release will use fetch depth 1 and a push will use 0, as expected.

Motivation and Context

Before the change, when the github.event_name == 'push' matched, the result was 0, which is falsy. That triggered the || 1, giving a result of 1. So, the result would always be 1, regardless of the value of github.event_name.

After the change if github.event_name is 'release', we'll get a truthy value (1), so we'll stop at the ||. Otherwise, we'll fall through and return 0, which is the value that we need for a 'push' event.

How Has This Been Tested?

This will be tested once it is merged.

Checklist:

• N/A - I have updated the documentation accordingly.
• All new and existing tests passed.