feat(chart): allow for template on host input

[jdcmarques]

Description

• Allow for hostnames to be helm temptable
  • api.host
  • api.argocd.urls{*}
  • externalWebhooksServer.host

Previously the fields must have been set with

api:
  host: kargo.example.com
externalWebhooksServer:
  host: webhooks.kargo.example.com

We can now do something like:

global:
  baseDomain: 'example.com'

api:
  host: "kargo.{{ .Values.global.baseDomain }}"
externalWebhooksServer:
  host: "webhooks.kargo.{{ .Values.global.baseDomain }}"  

Validation

Rendered before and after proposed changes and had no diff in the outcome templates

• api.oidc.enabled - true and false
• api.oidc.dex.enabled - true and false
• api.tls.enabled.selfSignedCert - true and false
• externalWebhooksServer.tls.enabled - true and false
• externalWebhooksServer.tls.selfSignedCert - true and false

Addresses #5630

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