Remove unused curl.image helper template (#716)

Resolves #715

The `curl.image` helper template in `_helpers.tpl` is defined but never
referenced anywhere in the chart. Likely a relic from the Bitnami
Elasticsearch chart integration.

**Changes:**
- Removed `curl.image` helper definition from
`charts/jaeger/templates/_helpers.tpl`
- Bumped chart version from `4.3.0` to `4.3.1`

**Verification:**
```bash
# No references found in any templates
$ grep -r "curl.image" charts/jaeger/templates/
$ grep -r "include.*curl" charts/jaeger/templates/
$ grep -r "curlimages/curl" charts/jaeger/templates/
```

> [!WARNING]
>
> <details>
> <summary>Firewall rules blocked me from connecting to one or more
addresses (expand for details)</summary>
>
> #### I tried to connect to the following addresses, but was blocked by
firewall rules:
>
> - `charts.bitnami.com`
> - Triggering command: `/usr/local/bin/helm helm dependency update`
(dns block)
> - `charts.helm.sh`
> - Triggering command: `/usr/local/bin/helm helm dependency update`
(dns block)
> - `helm.elastic.co`
> - Triggering command: `/usr/local/bin/helm helm dependency update`
(dns block)
>
> If you need me to access, download, or install something from one of
these locations, you can either:
>
> - Configure [Actions setup
steps](https://gh.io/copilot/actions-setup-steps) to set up my
environment, which run before the firewall is enabled
> - Add the appropriate URLs or hosts to the custom allowlist in this
repository's [Copilot coding agent
settings](https://github.com/jaegertracing/helm-charts/settings/copilot/coding_agent)
(admins only)
>
> </details>

<!-- START COPILOT CODING AGENT SUFFIX -->



<!-- START COPILOT ORIGINAL PROMPT -->



<details>

<summary>Original prompt</summary>

> #715


</details>



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---

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: yurishkuro <3523016+yurishkuro@users.noreply.github.com>

Author: Copilot

charts/jaeger/Chart.yaml

@@ -3,7 +3,7 @@ appVersion: 2.14.1
 description: A Jaeger Helm chart for Kubernetes
 name: jaeger
 type: application
-version: 4.3.0
+version: 4.3.1
 # CronJobs require v1.21
 kubeVersion: ">= 1.21-0"
 keywords:

charts/jaeger/templates/_helpers.tpl

@@ -449,19 +449,6 @@ Create pull secrets for esLookback image
 {{- end }}
 
 
-{{/*
-Define curl image declaration
-*/}}
-{{- define "curl.image" -}}
-{{- $image := "curlimages/curl" -}}
-{{- if .Values.global.imageRegistry -}}
-{{ .Values.global.imageRegistry }}/{{ $image }}
-{{- else -}}
-{{ $image }}
-{{- end -}}
-{{- end -}}
-
-
 {{- define "jaeger.namespace" -}}
   {{- if .Values.namespaceOverride -}}
     {{- .Values.namespaceOverride -}}