Enable a function to be emulated in multiple regions

[kmcnellis]

Description

Enable function emulation for all the regions listed in the .region('us-central1','europe-west1') config (not just the first one)

Scenarios Tested

• Hosting function rewrites
• Firestore background trigger
• Directly calling function url

Changed output

✔  functions[us-central1-express]: http function initialized (http://localhost:5001/test-project/us-central1/express).
✔  functions[europe-west1-test]: http function initialized (http://localhost:5001/test-project/europe-west1/test).
✔  functions[europe-west2-test]: http function initialized (http://localhost:5001/test-project/europe-west2/test).
✔  functions[europe-west1-fire3]: firestore function initialized.
✔  functions[europe-west2-fire3]: firestore function initialized.
✔  functions[us-central1-fire4]: firestore function initialized.
✔  functions[europe-west2-fire4]: firestore function initialized.

[samtstern]

@kmcnelis approved, just have to deal with the test failures

[kmcnellis]

Oh, odd. I ran npm run test, but I guess that doesn't include everything

[jirizavadil]

Hi,
although nice addition, this broke every firebase.functions().httpsCallable('lala') for me 🙃

Emulator now expects firebase.functions().httpsCallable('region-lala'), which differs from the cloud environment. I have most functions in europe-west1 and rest in us-central. No function is in multiple regions.

[samtstern]

@jirizavadil oh no, thanks for filing this! I'll start a new issue.

[samtstern]

@jirizavadil please comment on #3418 to let me know how to reproduce this.