Add non-DAG bundle deploys

[jeremybeard]

Adds deploy-type: non-dags (Astro CLI 1.44.0+), which deploys any directory as a non-DAG bundle mounted for DAGs to read. As with dbt, the directory is root-folder. It is required, as is mount-path; non-dags-bundle-type is an optional label.

The bundle deploy step, shared with dbt, also gains:

• bundle-trigger-paths, the bundle equivalent of image-trigger-paths
• skip-unchanged support
• a deploy when the diff base is missing from the checkout
• always deploying on create-deployment-preview, never on delete-deployment-preview

Validation: deploy-type is now checked, where an unknown value used to deploy nothing. root-folder is required with non-dags, since an empty one would deploy the whole repository. image-name, parse, pytest and build-secrets are rejected with non-dags, as the CLI rejects them alongside --non-dags. A mount-path on other deploy types is a warning.

E2E, on one new bundle deployment: the non-DAG deploy, the skip and fallback paths, trigger-path parsing, a non-DAG deploy to a preview, and the delete guard.

[neel-astro]

curious q: do we need to normalize the root-folder, I mean stripping any "." or "/" at prefix ("./dbt"), I don't mind to skip it here if we are not doing it in dag/image deploy check?

[jeremybeard]

It's done this way for all deploy types so will leave it like this.