Priority indicators: update logic to match new priority matrix

[jeherve]

Note

Follow-up to #40501
I'll merge #40501 and its equivalents in our different repos that use the action once I have a review on this PR.

Proposed changes:

We now ask different questions in our issue templates:
#40501

This commit updates the logic to match the new questions and answers. It also captures the optional extra information ("other impact(s)") an issue can have, since that info can bump the severity, and in turn the priority, of an issue.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Jetpack product discussion

See pfVjQF-su-p2

Does this pull request change what data or activity we track or use?

• No

Testing instructions:

This can be tested in a fork.

Here is an example:
jeherve#197

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[tbradsha]

Looks good to me!

[inaikem]

Looks good to me 🙂

[anomiex]

You're allowing multiple selections for the additional-impact in #40501. This logic assumes they can select only one.

[anomiex]

If priority got changed, this will produce

find-priority:  priority indicators found. Priority set to Whatever.

Should there be something other than just a space in the else case?