Allow to set non-concurrent CI pipeline

[mkleszcz]

Description

Related to #453

For the new AWS accounts there is an issue with the AWS CodePipeline concurrent builds. Initially the concurrent builds are not possible so pipeline is not working.

Describe the solution you'd like

We should have a setting in the stack that will enable concurrent build by setting runOrders in the correct way. By default this should work as it is but there should be a way of changing this behavior and it should be documented in the docs.

Describe alternatives you've considered

No response

Additional context

No response

Validations

• Follow our Code of Conduct.
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.