labels property not evaluating in VictoryBar when data objects contain a "label" property

**Describe the bug**
When using VictoryBar, the labels property is not evaluated properly when the "data" property does not follow a specific structure.

**Victory version**
Which npm version are you using?

**To Reproduce**
```
const data = [
{label: "A", value: 1},
{label: "B", value: 2},
];

const barProps = {
x: "label",
y: "value",
data,
labels: () => "Hello World",
}

```

**Expected behavior**
Labels should be "Hello World"

**Additional context**
This works:
```
const data = [
{name: "A", value: 1},
{name: "B", value: 2},
];

const barProps = {
x: "name",
y: "value",
data,
labels: () => "Hello World",
}

```

Start by reproducing the provided VictoryBar example with data objects using the `label` property, then trace label evaluation from the VictoryBar entry point. Compare it with the working `name` example and verify that the callback produces "Hello World" for both bars.

Written by the indexing model from the issue text.