refactor: collect-deps.sh

[bk201]

Problem:

The previous method is to determine the latest dependency chart versions by listing the chart directories in the image. It's unreliable because RC version is considered newer than the formal version. For example:

$ yq e '.entries.fleet[].version' rancher-charts.yaml | sort -V -r
109.0.0+up0.15.0-rc.6
109.0.0+up0.15.0-rc.5
109.0.0+up0.15.0-rc.3
109.0.0+up0.15.0-rc.2
109.0.0+up0.15.0-rc.1
109.0.0+up0.15.0-beta.4
109.0.0+up0.15.0

This causes the ISO contain the wrong chart/appVersion and upgrade script will waiting for the wrong versions.

Solution:

• Get dependency chart versions from build.yaml because it's the single source of truth.
• Get appVersions from rancher/charts.
• Create a static file "scripts/rancher/deps.yaml" to store the dependency versions.
  Append the content to harvester-release.yaml during build time.
  This file should be updated when a developer bumps Rancher.
• Add a workflow to ensure the deps is bumped and the corresponding Rancher image contains the correct dependency charts.

Related Issue(s):

harvester/harvester#10312

Test plan:

• Validate the script
  Run

./scripts/collect-rancher-deps.sh

cat scripts/rancher/deps.yaml should get (for Rancher v2.14.0)`

rancherDependencies:
  fleet:
    chart: 109.0.0+up0.15.0
    app: "0.15.0"
  fleet-crd:
    chart: 109.0.0+up0.15.0
    app: "0.15.0"
  rancher-webhook:
    chart: 109.0.0+up0.10.0
    app: 0.10.0

• You can also validate the output by editing scripts/version-rancher to a different version.
• Build an ISO and ensure iso_root/harvester-release.yaml contain the above dependency info.

Additional documentation or context