Enable dashboards as part of workspace export-dir command

acceptance/cmd/workspace/export-dir-dashboard/dashboard.lvdash.json

@@ -0,0 +1,11 @@
+{
+  "pages": [
+    {
+      "name": "main",
+      "displayName": "Main",
+      "pageType": "PAGE_TYPE_CANVAS",
+      "layoutVersion": "GRID_V1",
+      "layout": []
+    }
+  ]
+}

acceptance/cmd/workspace/export-dir-dashboard/output.txt

@@ -0,0 +1,9 @@
+
+>>> [CLI] workspace mkdirs /Workspace/Users/[USERNAME]/export-dir-dashboard-[UNIQUE_NAME]
+
+>>> [CLI] workspace export-dir /Workspace/Users/[USERNAME]/export-dir-dashboard-[UNIQUE_NAME] [TEST_TMP_DIR]/export
+Exporting files from /Workspace/Users/[USERNAME]/export-dir-dashboard-[UNIQUE_NAME]
+/Workspace/Users/[USERNAME]/export-dir-dashboard-[UNIQUE_NAME]/export-dir-dashboard-[UNIQUE_NAME].lvdash.json -> [TEST_TMP_DIR]/export/export-dir-dashboard-[UNIQUE_NAME].lvdash.json
+Export complete
+
+>>> assert_exists.py [TEST_TMP_DIR]/export/export-dir-dashboard-[UNIQUE_NAME].lvdash.json

acceptance/cmd/workspace/export-dir-dashboard/script

@@ -0,0 +1,29 @@
+DASHBOARD_NAME="export-dir-dashboard-$UNIQUE_NAME"
+DASHBOARD_DIR="/Workspace/Users/$CURRENT_USER_NAME/export-dir-dashboard-$UNIQUE_NAME"
+dashboard_id=""
+
+cleanup() {
+    if [ -n "$dashboard_id" ]; then
+        $CLI lakeview trash "$dashboard_id" >> LOG.cleanup 2>&1 || true
+    fi
+    $CLI workspace delete "$DASHBOARD_DIR" --recursive >> LOG.cleanup 2>&1 || true
+}
+trap cleanup EXIT
+
+trace $CLI workspace mkdirs "$DASHBOARD_DIR"
+
+dashboard_id=$($CLI lakeview create \
+    --display-name "$DASHBOARD_NAME" \
+    --warehouse-id "$TEST_DEFAULT_WAREHOUSE_ID" \
+    --serialized-dashboard "$(cat dashboard.lvdash.json)" \
+    --json "{\"parent_path\": \"$DASHBOARD_DIR\"}" \
+    -o json | jq -r '.dashboard_id')
+add_repl "$dashboard_id" DASHBOARD_ID
+
+mkdir -p "$TEST_TMP_DIR/export"
+trace $CLI workspace export-dir "$DASHBOARD_DIR" "$TEST_TMP_DIR/export"
+
+# The Lakeview backend normalizes the serialized dashboard on create (e.g. it
+# drops an empty "layout": []), so the exported content is not byte-identical to
+# the input. Assert the dashboard was exported rather than diffing the content.
+trace assert_exists.py "$TEST_TMP_DIR/export/$DASHBOARD_NAME.lvdash.json"

acceptance/cmd/workspace/export-dir-dashboard/test.toml

@@ -0,0 +1,12 @@
+Cloud = true
+RequiresWarehouse = true
+
+# export-dir prints the local destination with OS-native separators, so the
+# output diverges on Windows. The exported-dashboard behavior is OS-independent,
+# so cover it on Linux/macOS only.
+GOOS.windows = false
+
+EnvMatrix.DATABRICKS_BUNDLE_ENGINE = ["direct"]
+Ignore = [
+  "export",
+]

cmd/workspace/workspace/export_dir.go

@@ -57,7 +57,6 @@ func isFileSizeError(err error) bool {
 // These will be skipped with a warning during export-dir.
 var nonExportableTypes = []workspace.ObjectType{
 	workspace.ObjectTypeLibrary,
-	workspace.ObjectTypeDashboard,
 	workspace.ObjectTypeRepo,
 	// MLFLOW_EXPERIMENT is not defined as a constant in the SDK
 	workspace.ObjectType("MLFLOW_EXPERIMENT"),