Error during access to the item of the list

### What happened?
During the access to the list item by index or by the `first` function inside the template, I got the error:
``` result: cannot execute template: template: manifests:10:18: executing "manifests"
at : error calling index: index of untyped nil
```

log data
```
2024-03-18T20:45:49.992Z DEBUG fn/fn.go:60 template {"template": "---\napiVersion: example.acme.io/v1beta1\nkind: Debug\nmetadata:\n name: test-debug\n annotations:\n gotemplating.fn.crossplane.io/composition-resource-name: test-debug\nspec:\n ip: {{ (first .observed.resources.pod.resource.status.atProvider.manifest.status.hostIPs).ip }}\n"}
2024-03-18T20:45:49.993Z DEBUG fn/fn.go:74 constructed request map {"request": {"context":{"apiextensions.crossplane.io/environment":{}},"desired":{"composite":{"resource":{"apiVersion":"example.acme.io/v1beta1","kind":"XR"}},"resources":{"pod":{"resource":{"apiVersion":"kubernetes.crossplane.io/v1alpha2","kind":"Object","spec":{"forProvider":{"manifest":{"apiVersion":"v1","kind":"Pod","metadata":{"name":"nginx","namespace":"default"},"spec":{"containers":[{"image":"nginx:1.14.0","name":"nginx"}]}}},"providerConfigRef":{"name":"kubernetes-provider"}}}}}},"input":{"apiVersion":"gotemplating.fn.crossplane.io/v1beta1","inline":{"template":"---\napiVersion: example.acme.io/v1beta1\nkind: Debug\nmetadata:\n name: test-debug\n annotations:\n gotemplating.fn.crossplane.io/composition-resource-name: test-debug\nspec:\n ip: {{ (first .observed.resources.pod.resource.status.atProvider.manifest.status.hostIPs).ip }}\n"},"kind":"GoTemplate","source":"Inline"},"observed":{"composite":{"resource":{"apiVersion":"example.acme.io/v1beta1","kind":"XR","metadata":{"annotations":{"kubectl.kubernetes.io/last-applied-configuration":"{\"apiVersion\":\"example.acme.io/v1beta1\",\"kind\":\"XR\",\"metadata\":{\"annotations\":{},\"name\":\"test\"},\"spec\":{\"data\":\"top-secret\"}}\n"},"creationTimestamp":"2024-03-18T20:44:44Z","finalizers":["composite.apiextensions.crossplane.io"],"generation":3,"labels":{"crossplane.io/composite":"test"},"managedFields":[{"apiVersion":"example.acme.io/v1beta1","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:finalizers":{".":{},"v:\"composite.apiextensions.crossplane.io\"":{}},"f:labels":{".":{},"f:crossplane.io/composite":{}}},"f:spec":{"f:compositionRef":{".":{},"f:name":{}},"f:compositionRevisionRef":{".":{},"f:name":{}}}},"manager":"crossplane","operation":"Update","time":"2024-03-18T20:44:44Z"},{"apiVersion":"example.acme.io/v1beta1","fieldsType":"FieldsV1","fieldsV1":{"f:status":{".":{},"f:conditions":{".":{},"k:{\"type\":\"Synced\"}":{".":{},"f:lastTransitionTime":{},"f:message":{},"f:reason":{},"f:status":{},"f:type":{}}}}},"manager":"crossplane","operation":"Update","subresource":"status","time":"2024-03-18T20:44:44Z"},{"apiVersion":"example.acme.io/v1beta1","fieldsType":"FieldsV1","fieldsV1":{"f:metadata":{"f:annotations":{".":{},"f:kubectl.kubernetes.io/last-applied-configuration":{}}},"f:spec":{".":{},"f:compositionUpdatePolicy":{},"f:data":{}}},"manager":"kubectl-client-side-apply","operation":"Update","time":"2024-03-18T20:44:44Z"}],"name":"test","resourceVersion":"654357","uid":"1aa8b1d7-b30f-4d3b-be9f-05f8192232fa"},"spec":{"compositionRef":{"name":"function-go-template"},"compositionRevisionRef":{"name":"function-go-template-1737ec3"},"compositionUpdatePolicy":"Automatic","data":"top-secret"},"status":{"conditions":[{"lastTransitionTime":"2024-03-18T20:44:44Z","message":"cannot compose resources: pipeline step \"go-templating\" returned a fatal result: cannot execute template: template: manifests:9:10: executing \"manifests\" at : error calling first: runtime error: invalid memory address or nil pointer dereference","reason":"ReconcileError","status":"False","type":"Synced"}]}}}}}}
```

### How can we reproduce it?

composition.yaml

```yaml
apiVersion: apiextensions.crossplane.io/v1
kind: Composition
metadata:
name: function-go-template
spec:
compositeTypeRef:
apiVersion: example.acme.io/v1beta1
kind: XR
mode: Pipeline
pipeline:
- step: patch-and-transform
functionRef:
name: function-patch-and-transform
input:
apiVersion: pt.fn.crossplane.io/v1beta1
kind: Resources
resources:
- name: pod
base:
apiVersion: kubernetes.crossplane.io/v1alpha2
kind: Object
spec:
providerConfigRef:
name: kubernetes-provider
forProvider:
manifest:
apiVersion: v1
kind: Pod
metadata:
name: nginx
namespace: default
spec:
containers:
- name: nginx
image: nginx:1.14.0
- step: go-templating
functionRef:
name: function-go-templating
input:
apiVersion: gotemplating.fn.crossplane.io/v1beta1
kind: GoTemplate
source: Inline
inline:
template: |
---
apiVersion: example.acme.io/v1beta1
kind: Debug
metadata:
name: test-debug
annotations:
gotemplating.fn.crossplane.io/composition-resource-name: test-debug
spec:
ip: {{ (first .observed.resources.pod.resource.status.atProvider.manifest.status.hostIPs).ip }}

```

definition.yaml

```yaml
apiVersion: apiextensions.crossplane.io/v1
kind: CompositeResourceDefinition
metadata:
name: xrs.example.acme.io
spec:
group: example.acme.io
names:
kind: XR
plural: xrs
versions:
- name: v1beta1
served: true
referenceable: true
schema:
openAPIV3Schema:
type: object
properties:
spec:
type: object
properties:
data:
type: string

---
apiVersion: apiextensions.crossplane.io/v1
kind: CompositeResourceDefinition
metadata:
name: debugs.example.acme.io
spec:
group: example.acme.io
names:
kind: Debug
plural: debugs
versions:
- name: v1beta1
served: true
referenceable: true
schema:
openAPIV3Schema:
type: object
properties:
spec:
type: object
properties:
ip:
type: string
```

xr.yaml

```yaml
apiVersion: example.acme.io/v1beta1
kind: XR
metadata:
name: test
spec:
data: top-secret
```

### What environment did it happen in?
* function-go-templating **v0.4.1**
* Crossplane **v0.15.1**

Reproduce the failure with the supplied composition.yaml, definition.yaml, and xr.yaml, then start at the template execution path shown in fn/fn.go. Trace how access to the missing status.hostIPs value is handled and establish the expected behavior for the template expression. Done should be defined by a reproducible result that no longer produces the reported nil-access failure.

Written by the indexing model from the issue text.