[WOR-1226] For Azure billing projects, return the region of the landing zone

[cahrens]

Ticket: https://broadworkbench.atlassian.net/browse/WOR-1226

This passes through the region for Azure landing zones in the billing projects response (both list and single billing project signatures). Note that regions have been backfilled yet for existing landing zones, so old landing zones will temporarily return an empty string for region.

Response when running this branch locally against dev databases:

{
        "cloudPlatform": "AZURE",
        "invalidBillingAccount": false,
        "landingZoneId": "43217cdd-8037-463c-b119-3e8bdf6b0b97",
        "managedAppCoordinates": {
            "managedResourceGroupId": "mrg-terra-dev-previ-20240212144940",
            "subscriptionId": "df547342-9cfd-44ef-a6dd-df0ede32f1e3",
            "tenantId": "fad90753-2022-4456-9b0a-c7e5b934e408"
        },
        "projectName": "CARFeb12West",
        "protectedData": false,
        "region": "westus2", <-- newly created landing zone
        "roles": [
            "Owner"
        ],
        "status": "Ready"
    },
    {
        "cloudPlatform": "AZURE",
        "invalidBillingAccount": false,
        "landingZoneId": "2afef35f-991f-41ed-8dde-12a846ab9dd0",
        "managedAppCoordinates": {
            "managedResourceGroupId": "mrg-terra-dev-previ-20230119110658",
            "subscriptionId": "df547342-9cfd-44ef-a6dd-df0ede32f1e3",
            "tenantId": "fad90753-2022-4456-9b0a-c7e5b934e408"
        },
        "projectName": "CARJan19bemis",
        "protectedData": false,
        "region": "", <-- old landing zone that hasn't been backfilled
        "roles": [
            "Owner"
        ],
        "status": "Ready"
    },
    {
        "cloudPlatform": "AZURE",
        "invalidBillingAccount": false,
        "landingZoneId": "5723f447-aaca-47e7-9b55-07c349cd7544",
        "managedAppCoordinates": {
            "managedResourceGroupId": "mrg-terra-dev-previ-20230607135519",
            "subscriptionId": "df547342-9cfd-44ef-a6dd-df0ede32f1e3",
            "tenantId": "fad90753-2022-4456-9b0a-c7e5b934e408"
        },
        "message": "Landing Zone deletion failed: Landing Zone 5723f447-aaca-47e7-9b55-07c349cd7544 not found.",
        "projectName": "CARJan7Local",
        "protectedData": false, <-- No region field because landing zone no longer exists
        "roles": [
            "Owner"
        ],
        "status": "DeletionFailed"
    },
  

---

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[cahrens]

jenkins retest

[cahrens]

jenkins retest

[blakery]

Nit: I understand what this means since I know the scope of changes in this PR , but the wording is kind of confusing otherwise.

[cahrens]

Thanks, it was a copy/paste error.

[blakery]

If you use Option(landingZone.getRegion), you'll get the result of None if it's absent/null, and Some(region) if present. That's probably preferable to the behavior as written here, which will give Some(null)` if the region is not present, since nulls should generally be avoided in scala (avoiding null anywhere is ideal IMO, but scala has explicit conventions around discouraging null values).

[cahrens]

Ah, definitely better. Thank you!

[cahrens]

jenkins retest

[cahrens]

@blakery I addressed your feedback (and got a passing swatomation run!)