feat: add env-compact format.

[ya7010]

Currently, the env format of the load command passes an empty string for undefined environment variables.
This can cause applications to recognize the environment variable as existing.

As a countermeasure, I have added env-compact format that does not output undefined environment variables.

I considered adding --skip-undefined option, but since it would only affect env, so I have added a new format instead.

[changeset-bot]

🦋 Changeset detected

Latest commit: 610a14c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
varlock	Patch
@varlock/astro-integration	Patch
@varlock/nextjs-integration	Patch
@varlock/vite-integration	Patch
@varlock/1password-plugin	Patch
@varlock/google-secret-manager-plugin	Patch

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[ya7010]

@theoephraim

I'm torn between defining a new format or just adding more options — which do you think is better?

[theoephraim]

@ya7010 - I think an option makes sense. The compact flag still kind of makes sense in other formats. For example in the pretty printed format, it could just skip empty items.

[ya7010]

@theoephraim

Added the --compact option and modified it to skip undefined environment variables when used with the env format.

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commit: 610a14c