Add skip_create_image config parameter to builder

[Voldemat]

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Description

The feature is fairly simple, if skip_create_image=true we don`t publish AMI in cloud, just run defined provisioners to ensure that all scripts are correct. Otherwise, is skip_create_image=false whole process left unchanged.
I can create pull request for that, just wanna make sure you are cool with it.

Use Case(s)

For example, I have CI/CD pipeline where I build packer image. So I add changes to build configuration in some branch, let`s say feature/change-packer. Now I want to check my scripts are correct before I merge into main branch. In order to do that, whole building process should run but without publishing actual AMI image, it would be done in the main branch.

Potential configuration

skip_create_image=false

Potential References

Such feature already implemented in Google Packer Plugin, link to pull request provided below.
hashicorp/packer#10496

[apricote]

We are open to merging a pull request for this :)