Show relation record labels instead of UUIDs in dashboard charts (#23163)

https://github.com/user-attachments/assets/d012a013-2c90-49a1-a27e-b8e4b684a84f



Charts grouped by a relation without a sub-field rendered raw FK UUIDs
on axis ticks, legends and tooltips. The server now batch-resolves the
grouped record ids to their label identifier through a permission-scoped
query and formats every bucket with the record's display name.
Unresolvable records (deleted or not readable) render as Unknown and
their ids are stripped from the response payload. Same-named records get
an ordinal suffix so their buckets don't merge. Covers bar, line and
pie, plain and morph relations.

```mermaid
flowchart TD
    A["Dashboard widget load"] --> B["Chart data service<br/>(bar / line / pie)"]
    B --> C["executeGroupByQuery:<br/>group by relation FK id,<br/>ORDER BY target label identifier,<br/>scoped to source object permissions"]
    C --> D["filterOutEmptyChartBuckets"]
    D --> E{"Bare relation axis?<br/>(no sub-field)"}

    subgraph RL["ChartRelationLabelService.resolveRelationLabels"]
        direction TB
        G1["Collect distinct record ids<br/>per target object"] --> G2["Batch SELECT label identifier columns,<br/>scoped to TARGET object permissions"]
        G2 --> G3["buildRawLabelByRecordId:<br/>display name per record"]
        G3 --> G4["buildUniqueRelationLabels:<br/>suffix duplicates, Unknown for unresolved"]
    end

    E -- No --> H["formatDimensionValue per bucket"]
    E -- Yes --> G1
    G4 --> H
    H --> I["Strip unresolved ids from<br/>formattedToRawLookup"]
    I --> J["Chart DTO to frontend"]
```

The chart settings sub-field dropdown gains a Record option to group by
the related record itself, and now only offers sub-fields the backend
accepts (system fields like a workspace member's updatedBy were
selectable but rejected at query time). Chart-data errors are now logged
server-side.

Also fixes two latent bugs on this path: sorting a bare-relation chart
by field threw `Cannot orderBy unknown field: agentId`, and the pie
chart truncated slices before sorting. The AI dashboard tool guidance
and the seeded dashboards no longer force the sub-field workaround.

The group-by query orders buckets by the related record's label
identifier at the database level (the engine now accepts ordering by a
target field when grouping by its id), so with more than 100 distinct
related records the surviving buckets match the label order.

packages/twenty-server/src/modules/dashboard/tools/create-complete-dashboard.tool.ts

@@ -73,9 +73,9 @@ WIDGET TYPES:
 
 2. GRAPH with configurationType "BAR_CHART":
    - Additional required: configuration.primaryAxisGroupByFieldMetadataId, configuration.layout ("VERTICAL" or "HORIZONTAL")
-   - IMPORTANT: When grouping by a RELATION field (e.g. owner, company), you MUST provide primaryAxisGroupBySubFieldName (e.g. "name", "email") — otherwise it groups by raw UUID which is useless. Composite fields (e.g. address) also require a subfield (e.g. "addressCity").
+   - When grouping by a RELATION field (e.g. owner, company), omit primaryAxisGroupBySubFieldName to group by the related record itself, labelled with its display name. Provide a subfield (e.g. "name", "email") only to group by that specific attribute instead. Composite fields (e.g. address) always require a subfield (e.g. "addressCity").
    - Example (simple field): { type: "GRAPH", objectMetadataId: "<opportunity-object-uuid>", configuration: { configurationType: "BAR_CHART", aggregateFieldMetadataId: "<amount-field-uuid>", aggregateOperation: "COUNT", primaryAxisGroupByFieldMetadataId: "<stage-field-uuid>", layout: "VERTICAL" } }
-   - Example (relation field): { type: "GRAPH", objectMetadataId: "<opportunity-object-uuid>", configuration: { configurationType: "BAR_CHART", aggregateFieldMetadataId: "<amount-field-uuid>", aggregateOperation: "SUM", primaryAxisGroupByFieldMetadataId: "<company-field-uuid>", primaryAxisGroupBySubFieldName: "name", layout: "VERTICAL" } }
+   - Example (relation field): { type: "GRAPH", objectMetadataId: "<opportunity-object-uuid>", configuration: { configurationType: "BAR_CHART", aggregateFieldMetadataId: "<amount-field-uuid>", aggregateOperation: "SUM", primaryAxisGroupByFieldMetadataId: "<company-field-uuid>", layout: "VERTICAL" } }
 
 3. GRAPH with configurationType "LINE_CHART":
    - Additional required: configuration.primaryAxisGroupByFieldMetadataId