[Feature] Add GetResolvedHostType() getter to Config for downstream host type access

[tanmay-db]

Summary

Adds a GetResolvedHostType() public getter on Config that exposes the host type resolved from the /.well-known/databricks-config discovery endpoint, without falling back to URL pattern matching heuristics.

Why

The existing HostType() method combines two behaviors: it checks the resolved host metadata first, then falls back to URL pattern matching. Downstream consumers like the Terraform provider need access to only the metadata-resolved host type to make decisions about host-agnostic behavior — without the URL-based fallback polluting the result.

Today, resolvedHostType is a private field with no public accessor, so downstream packages cannot distinguish between "metadata says this is a workspace host" and "we guessed from the URL pattern."

This getter provides a clean, minimal API for that use case.

What changed

Interface changes

• (*Config).GetResolvedHostType() HostType — Returns the host type resolved from host metadata discovery. Returns HostTypeUnknown if
  metadata has not been resolved or did not include a host type. Unlike HostType(), this method does not fall back to URL pattern matching.

Behavioral changes

None. This is a new accessor for an existing internal field.

Internal changes

None.

How is this tested?

4 unit tests added in config/config_test.go:

• TestGetResolvedHostType_ReturnsUnknownByDefault — fresh Config returns HostTypeUnknown
• TestGetResolvedHostType_ReturnsResolvedValue — returns WorkspaceHost when set
• TestGetResolvedHostType_AccountHost — returns AccountHost when set
• TestGetResolvedHostType_UnifiedHost — returns UnifiedHost when set

All pass locally via go test -run TestGetResolvedHostType ./config/.

[github-actions]

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Trigger:
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Inputs:

• PR number: 1615
• Commit SHA: 1aa1ee5c43c0781ce12af2cbf7bc4f771de2ca62

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