Support `user_data` in Console UI

Description

https://cloud.ibm.com/docs/vpc?topic=vpc-user-data

When you create an IBM Cloud® Virtual Servers for Virtual Private Cloud instance, you can specify optional user data that automatically performs common configuration tasks or runs scripts. For more information about user data and usernames, see IAM access.

VPC uses Cloud-init technology to configure virtual server instances. The User Data field on the New virtual server for VPC page allows users to put in custom configuration options by using cloud-init. Cloud-init supports several formats for configuration data, including yaml in a cloud-config file.

user_data is integral VSI instance functionality and we need it to install software on the VSI during startup.

I see that user_data is definable using override_json_string, but I think its important enough to be a standalone variable.

Users must be able to input something like this in the Deployable Architecture - Configure > Optional panel.

#cloud-config
users:
  - name: demouser
    gecos: Demo User
    sudo: ALL=(ALL) NOPASSWD:ALL
    groups: users, admin
    ssh_import_id: None
    lock_passwd: true

[ ] Add user_data support as an optional configuration field.
[ ] The option should be segmented by management and workload VSIs. There is a high chance that the user_data directive will be very different between management and workload VSIs.
[ ] The help text must link to https://cloud.ibm.com/docs/vpc?topic=vpc-user-data.

New or affected modules

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terraform-ibm-modules / terraform-ibm-landing-zone

Support `user_data` in Console UI #863

Description

New or affected modules