Update push event: Mention it can trigger non-default branch workflows

[mcummings128]

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Regarding the push event behavior, adds a note that workflows not merged to the default branch can be triggered by push events. This is useful to call out specifically because there will be times when users need to test a workflow but cannot merge it to the default branch for whatever reason. Having this in official documentation helps users have a reputable, citable source regarding how to trigger a workflow without merging into the default branch--methods to do so are not explicitly mentioned in any documentation I've come across

This doesn't have to be in NOTE format specifically, but the content should be there.

See the documentation

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actions/reference/workflows-and-actions/events-that-trigger-workflows.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17 3.16	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17 3.16

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