Combine the release_perform and release_publish Fastlane lanes

[Widcket]

Changes

Currently, performing a release once the release PR has been merged involves invoking two commands:

• bundle exec fastlane ios release_perform. This creates the tag and pushes it to the remote.
• bundle exec fastlane ios release_publish. This publishes the pod spec to the Cocoapods trunk.

This is a leftover from the old release scripts, before the new release CLI, as the process had multiple steps. This PR simplifies the new process by merging the release_perform and release_publish steps into a single release step (lane).

Testing

• This change adds unit test coverage
• This change has been tested on the latest version of the platform/language or why not

Checklist

• I have read the Auth0 general contribution guidelines
• All existing and new tests complete without errors
• All active GitHub checks have passed