fix: prioritize boolean cors value over debug flags

[stfsy]

Description

As discussed in https://github.com/firebase/firebase-tools/issues/4862 it's not possible to disable cors in v2 functions when running in the emulator, because the emulator enables the debug feature for cors overriding opts.cors.

If we could prioritize the boolean flag over the debug feature, we could have both: The ability to disable cors and also prioritize the debug flag over user provided configuration.

Code sample

[stfsy]

@taeold updated as per suggestion and rebased

[stfsy]

@taeold anything else I can do?

[stfsy]

@taeold got it now, had to run npm run format:fix to fix the formatting error. I committed and pushed the changes just a few seconds ago.

[colerogers]

@stfsy I fixed your merge conflicts but it looks like you need to run npm run format one more time before we can merge this.

[stfsy]

@colerogers thank you very much 🙂 I ran npm run format and commited+pushed the results