Merge valuesFrom with BigBang compose

[runyontr]

Description

When using a zarf.yaml to extend an existing bigbang definition like:

components:
  - name: cocowow
    required: true
    import:
      path: ../defense-unicorns-distro
      name: bigbang
    extensions:
      bigbang:
        version: "###ZARF_PKG_VAR_BIGBANG_VERSION###"
        valuesFiles:
        # look at imports and then merging here for composition
        - ../values/authservice.yaml
        - ../values/keycloak.yaml

Zarf ignores the provided values files in this zarf.yaml

Related Issue

Relates to #1060

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (security config, docs update, etc)

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

[netlify]

✅ Deploy Preview for zarf-docs canceled.

Name	Link
🔨 Latest commit	0060e99
🔍 Latest deploy log	https://app.netlify.com/sites/zarf-docs/deploys/6425ce00ccd26700086767dc

[Racer159]

good 'nuf