Can't add additional backend services to Helm chart ingress

### Describe the bug

The current ingress only allows to expose the Polaris service, since the `backend.service.name` is "hardcoded" as the service name and port is set as the polaris service port. Seen the code snippet below
```
- host: {{ .host | quote }}
http:
paths:
{{- range .paths }}
- path: {{ .path }}
pathType: {{ .pathType }}
backend:
service:
name: {{ $fullName }}
port:
number: {{ $svcPort }}
```
This prevent user from exposing other backend services like the management service. We might want to allow user to expose additional services besides the core service.

### To Reproduce

I want to configure the value.yaml to expose both polaris service and management service
```
ingress:
className: "somename"
enabled: true
hosts:
- host: chart-example.local
paths:
- path: /polaris
pathType: Prefix
backend:
service:
name: polaris-release
port: 8081
- path: /polaris-mgmt
pathType: Prefix
backend:
service:
name: polaris-release-mgmt
port: 8082
```

### Actual Behavior

It would result as
```
- host: chart-example.local
http:
paths:
- path: /polaris
pathType: Prefix
backend:
service:
name: polaris-release
port:
number: 8181
- path: /polaris-mgmt
pathType: Prefix
backend:
service:
name: polaris-release
port:
number: 8181
```

### Expected Behavior

```
- host: chart-example.local
http:
paths:
- path: /polaris
pathType: Prefix
backend:
service:
name: polaris-release
port:
number: 8181
- path: /polaris-mgmt
pathType: Prefix
backend:
service:
name: polaris-release-mgmt
port:
number: 8182
```

### Additional context

_No response_

### System information

OS: MacOS
Polaris version: 1.2.0
Storage: S3

Inspect the Helm chart's ingress template and values.yaml, focusing on how each host path is rendered into a backend service name and port. Render the chart with separate Polaris and management paths; done means the generated ingress preserves the configured service names and ports for each path.

Written by the indexing model from the issue text.