[Internal] Use TEST_ENVIRONMENT_TYPE for integration test environment detection

[tanmay-db]

Summary

Centralizes integration test environment detection by replacing scattered ad-hoc checks with a single TEST_ENVIRONMENT_TYPE environment variable and a shared
skipIfNotEnvironmentType() helper.

Why

Today, each test prelude (workspaceTest, ucwsTest, accountTest, ucacctTest) uses its own combination of environment variable checks
(DATABRICKS_ACCOUNT_ID, TEST_METASTORE_ID) and runtime host-type inspection (cfg.HostType()) to decide whether to skip. This is fragile — different preludes
use different heuristics, making it easy for tests to run in the wrong environment or to silently pass when they should be skipped.

A single TEST_ENVIRONMENT_TYPE variable (ACCOUNT, WORKSPACE, UC_ACCOUNT, UC_WORKSPACE) set by the CI environment makes the contract explicit and
consistent across all test levels.

What changed

Interface changes

None.

Behavioral changes

None — this is a pure refactor of internal test infrastructure. Tests that previously skipped via ad-hoc checks now skip via TEST_ENVIRONMENT_TYPE. If the
variable is unset, tests skip with a clear message.

Internal changes

• Added skipIfNotEnvironmentType(t, expectedType) helper in internal/init_test.go
• workspaceTest: replaced DATABRICKS_ACCOUNT_ID presence check with skipIfNotEnvironmentType(t, "WORKSPACE")
• ucwsTest: replaced DATABRICKS_ACCOUNT_ID + TEST_METASTORE_ID checks with skipIfNotEnvironmentType(t, "UC_WORKSPACE")
• accountTest: replaced post-resolve cfg.HostType() check with skipIfNotEnvironmentType(t, "ACCOUNT") before config resolution
• ucacctTest: replaced post-resolve cfg.HostType() check with skipIfNotEnvironmentType(t, "UC_ACCOUNT") before config resolution

How is this tested?

Mirrors the same change already validated in the Terraform provider (databricks/terraform-provider-databricks#5476). Integration tests will be validated in CI with
TEST_ENVIRONMENT_TYPE set.

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Inputs:

• PR number: 1553
• Commit SHA: 45c99c50d57beaa6e9b9d222631b365107c7047e

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