Delete coomposer from all regions

[mik-laj]

Hello,

Currently, the script looks at all possible Compute regions and checks if there is a Cloud Composer instance there, even if the region is not officially supported by Cloud Composer. This can be done much easier if we use Assets Inventory.

gcloud alpha asset list --project polidea-airflow --asset-types=composer.googleapis.com/Environment

This is equivalent to an HTTP request:

==== request start ====
uri: https://cloudasset.googleapis.com/v1p5beta1/projects/polidea-airflow/assets?alt=json&assetTypes=composer.googleapis.com%2FEnvironment&contentType=CONTENT_TYPE_UNSPECIFIED
method: GET
== headers start ==
b'X-Goog-User-Project': b'polidea-airflow'
b'accept': b'application/json'
b'accept-encoding': b'gzip, deflate'
b'authorization': --- Token Redacted ---
b'content-length': b'0'
b'user-agent': b'google-cloud-sdk gcloud/320.0.0 command/gcloud.alpha.asset.list invocation-id/b8260cf3f01f4a68b01784f6d1f43a3b environment/None environment-version/None interactive/True from-script/False python/3.7.2 term/xterm-256color (Macintosh; Intel Mac OS X 20.2.0)'
== headers end ==
== body start ==

== body end ==
==== request end ====

Best regards, Kamil Breguła

[turbaszek]

Should we be able to use assets API? https://cloud.google.com/asset-inventory/docs/reference/rest