Add default bootstrap container

[vyaghras]

Issue number:

Closes #

Description of changes:
This pull request will add the default image to be used for Bootstrap container in Bottlerocket AMIs. We will use region based image URIs for AWS variants like aws-k8s-1.29 etc. And we will use public Bootstrap container image for Vmware and Metal variants AMIs.

This PR is dependednt on the changes in #4324 and needs to be merged after that.

Testing done:

• Should be able run a bootstrap container with default Bootstrap container image for AWS variants.
• Should be able run a bootstrap container with default Bootstrap container image for VMware and Metal variants.
• Should use the provided bootstrap container image if the image URI has been provided in user-data.
• One without source should use the default Bootstrap container and another with the given source should use that source.
• The bootstrap containers should not be changed to strong if we pass enabled and other bootstrap container settings from userdata or apiclient set
• Upgrade/Downgrade migration with the version containing default Bootstrap container.
• Upgrade/Downgrade migration for Bootstrap container version change.

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.