Do not require TestFlight submission when adding build to beta groups

[priitlatt]

Addresses #409

Action app-store-connect publish requires that build needs to be submitted to TestFlight in order to add the build to beta groups. This is not necessary and actually builds can be assigned to beta groups regardless of their TestFlight submission status.

This PR removes that arbitrary limitation and makes it possible to add published build to beta groups without TestFlight submission.

Examples

• Publish ipa and just add it to beta groups:

app-store-connect publish --path app.ipa --beta-group "Group 1" "Group 2"

• Publish ipa and just submit it to TestFlight:

app-store-connect publish --path app.ipa --testflight --whats-new "..."

• Publish ipa and both add it to beta groups and submit it to TestFlight:

app-store-connect publish \
    --path app.ipa \
    --beta-group "Group 1" "Group 2" \
    --testflight --whats-new "..."

Updated actions

• app-store-connect publish