Use the correct validity for EKS API tokens and handle long-running Kubernetes pipelines

[stefannica]

Describe changes

This PR addresses two problems:

1. the Kubernetes API tokens issued by the AWS Service Connector for EKS clusters had an incorrect TTL period of 60 minutes instead of 15 minutes as documented by AWS (source)
2. the shorter TTL causes problems when running Kubernetes orchestrated pipelines that take longer to build container images or take longer than 15 minutes to run.

Side-changes:

• some orchestrators, the Kubernetes orchestrator included, incorrectly instantiate the service connector they are linked to in the stack validation phase. This is not necessary and has the side effect that the connector credentials are generated before the container images are built and pushed. In the context of this PR, it is partially responsible for the expiration of credentials before the pipeline is triggered, because building and pushing container images can take longer than 15 minutes.
• this PR also fixes a bug that slipped through in Try/catch for Docker client #2513 that no longer allowed Docker credentials to be pulled from service connectors when building images for containerized pipelines. NOTE: if the container registry is linked to a service connector one does not need to run docker login to authenticate the docker client anymore.

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• If my change requires a change to docs, I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• If my changes require changes to the dashboard, these changes are communicated/requested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

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