Fixes the beanstalk env tests such that they can run in parallel better. Previously, only the beanstalk application was randomized, now the beanstalk environment is also randomized to help better facilitate running our tests in parallel.
```
=== RUN TestAccAWSBeanstalkEnv_outputs
--- PASS: TestAccAWSBeanstalkEnv_outputs (388.74s)
=== RUN TestAccAWSBeanstalkEnv_cname_prefix
--- PASS: TestAccAWSBeanstalkEnv_cname_prefix (386.78s)
=== RUN TestAccAWSBeanstalkEnv_config
--- PASS: TestAccAWSBeanstalkEnv_config (532.56s)
=== RUN TestAccAWSBeanstalkEnv_resource
--- PASS: TestAccAWSBeanstalkEnv_resource (420.47s)
=== RUN TestAccAWSBeanstalkEnv_vpc
--- PASS: TestAccAWSBeanstalkEnv_vpc (516.02s)
=== RUN TestAccAWSBeanstalkEnv_template_change
--- PASS: TestAccAWSBeanstalkEnv_template_change (623.38s)
=== RUN TestAccAWSBeanstalkEnv_basic_settings_update
--- PASS: TestAccAWSBeanstalkEnv_basic_settings_update (705.32s)
```
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