[4.7.x] Add pod.labels support to all helm charts

[kavindasr]

Purpose

Port of #174 (merged to 4.6.x) so that wso2.deployment.pod.labels is available on this branch too.

Goals

Add wso2.deployment.pod.labels configuration to all WSO2 APIM helm charts, enabling users to set custom labels for pod organization, monitoring, cost allocation, and policy enforcement.

Approach

Added pod.labels: {} to values.yaml and updated the deployment templates to merge custom labels with the default labels in all 5 charts:

• all-in-one (2 instances)
• distributed/control-plane (2 instances)
• distributed/gateway
• distributed/key-manager
• distributed/traffic-manager (2 instances)

Implementation follows the existing pod.annotations pattern for consistency.

Template changes:

labels:
  deployment: {{ template "chart.fullname" . }}
  product: apim
  {{- if .Values.wso2.deployment.pod.labels }}
  {{- toYaml .Values.wso2.deployment.pod.labels | nindent 8 }}
  {{- end }}

Usage example:

wso2:
  deployment:
    pod:
      annotations:
        prometheus.io/scrape: "true"
      labels:
        team: platform
        environment: production
        cost-center: engineering

Release note

Added support for custom pod labels via wso2.deployment.pod.labels configuration in all helm charts.

Documentation

README.md files for all 5 charts regenerated with helm-docs (v1.14.2).

Automation tests

• Unit tests: N/A (helm charts)
• Integration tests: helm lint passes for all 5 charts; helm template verified with both default values (output identical to before) and custom pod.labels (labels correctly merged into the pod template).

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? N/A (YAML templates only)
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Related PRs

• Add pod.labels support to all helm charts #174 (original, merged to 4.6.x)

Migrations (if applicable)

N/A - Backward compatible. Default value is an empty map {}, producing identical output to previous versions.

Test environment

• Helm 3.x
• helm-docs 1.14.2

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