[BUG] For PHP Symfony, both Swagger 2.0 and OpenAPI 3.0 samples are written to the same directory

Created by: ivan-aksamentov

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
What's the version of OpenAPI Generator used?
Have you search for related issues/PRs?
What's the actual output vs expected output?
[Optional] Bounty to sponsor the fix (example)

Description

When generating samples for PHP Symfony with ./bin/php-symfony-petstore.sh and ./bin/openapi3/php-symfony-petstore.sh the resulting bundles overwrite each other.

openapi-generator version

4.0.3

OpenAPI declaration file content or url

The default Pet Store ones, used for samples.

Command line used for generation

./bin/php-symfony-petstore.sh
./bin/openapi3/php-symfony-petstore.sh

Steps to reproduce

Run one script, observe results. Run another script. Results of the first script are partially overwritten.

Related issues/PRs

Suggest a fix

Fixed in #3532