feat: Add used_in_production arg in subaccount creation and update

[Thanhphan1147]

Purpose

Closes #273

With this PR users can now set used_for_production = UNSET | USED_FOR_PRODUCTION | NOT_USED_FOR_PRODUCTION when creating subaccounts

• ...

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[x] Feature
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Test the code

resource "btp_subaccount" "subaccount" {
  name = var.display_name
  subdomain = var.subdomain
  region = var.region
  parent_id = var.parent_guid
  used_for_procduction = "NOT_USED_FOR_PRODUCTION"
}

What to Check

Verify that the following are valid

• Verify that the subaccount created has the attribute correctly set

Other Information

[cla-assistant]

All committers have signed the CLA.

[lechnerc77]

Thanks for your contribution! Can you execute a make generate and commit the updated documentation to this PR?

[lechnerc77]

@Thanhphan1147 : No worries about the failed tests. I will check what is missing an eventually add new test recordings to this PR

[lechnerc77]

@Thanhphan1147 there is one issue to fix: you need to adjust the facade_accounts_subaccount_test.go. Due to the addition of the usage the expected result now deviates (see e.g. https://github.com/SAP/terraform-provider-btp/actions/runs/5532790691/jobs/10095867971?pr=288#step:6:214)

The other error in the test must be fixed by us by re-recording the test fixtures for the subaccount

[Thanhphan1147]

I updated the test file

[lechnerc77]

I merged it into a temporary branch to re-record the tests and then merge it into main.