chore(helm): bump chart version to 0.7.0

[o-pauloroberto]

Bumps the Helm chart version from 0.6.6 to 0.7.0.

This release includes opt-in ExternalSecret support (merged in #3418), which is a backward-compatible new feature — a minor version bump per SemVer.

Changes in this chart version

• externalsecret.yaml: new template — creates a namespace-scoped SecretStore + ExternalSecret when externalSecret.enabled=true, pulling all keys from AWS Secrets Manager via dataFrom.extract
• secret.yaml: skips inline Secret creation when externalSecret.enabled=true
• _helpers.tpl: added chart-deco-studio.validateExternalSecret — fails fast on misconfiguration (missing secretPath, conflict with secret.secretName)
• validations.yaml: wires in the new validation
• values.yaml: new externalSecret block (enabled: false by default — zero impact on existing deployments)

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Summary by cubic

Bumps the Helm chart to 0.7.0 to release opt-in ExternalSecret support for AWS Secrets Manager. Disabled by default and backward compatible.

• New Features
  • Opt-in externalSecret support (externalSecret.enabled=true) creating a namespace SecretStore and ExternalSecret.
  • Validation to catch misconfig (e.g., missing secretPath or conflicting secret.secretName) and skip inline Secret when ExternalSecret is enabled.

^{Written for commit 5b6e6d7. Summary will update on new commits. Review in cubic}