roach{prod,test}: ask users about their department when using Azure

[healthy-pod]

When a user is using roachprod with Azure, prompt them to choose their department from:

• Engineering
• Product
• Revenue

Only do this once, then cache the value in local roachprod config.

Use the department to choose which subscription id to use by mapping department name to subscription ID.

Jira issue: CRDB-32070

[blathers-crl]

cc @cockroachdb/test-eng

[jlinder]

A few additional thoughts:

• It would be ideal if this config file could be applied to choosing the default Azure subscription, GCP project or AWS account. (Because we will soon have different subscriptions / projects / accounts for different divisions.)
• The config file might allow for setting which subscription / project / account take use as the default in these ways:
  • by department name. This would make configuration easy for the internal user, use the hard-coded default for the specified division for cloud they're running against, and allow the default to change if it ever changes for that division.
  • by a specific subscription ID, project ID, or account ID/alias for their respective clouds. This would allow roachprod to be used by non-CRL employees.
• Suggesting ~/.config/roachprod/ as a good location for such a file