fix: return warnings on promoting lower semver verisonLabel

[nvanthao]

Fix: https://app.shortcut.com/replicated/story/136313/cli-reports-success-when-channel-promotion-is-silently-rejected-by-semver-ordering

We still allow promoting release with lower semver than latest release in semver channel, e.g. for patch release.
Just show a warning messages if any since the release get promoted but not gonna be the latest release due to semver order.

e.g.

replicated release promote 21 3DFXkTmfxiUyocBEU9TFEpw7w3w

Warning: Release 0.0.1 was promoted to channel "Unstable", but 6.0.0 remains the latest release because the channel is sorted by semver.

REPLICATED_OUTPUT=json replicated release promote 21 3DFXkTmfxiUyocBEU9TFEpw7w3w
{
  "channel": "3DFXkTmfxiUyocBEU9TFEpw7w3w",
  "release_sequence": 21,
  "version_label": "",
  "warnings": [
    "Release 0.0.1 was promoted to channel \"Unstable\", but 6.0.0 remains the latest release because the channel is sorted by semver."
  ]
}

replicated release create --version 5.4.0 --promote Unstable

  • Packaging charts ✓
  • Copying packaged charts to staging directory ✓
  • Collecting manifest files ✓
  • Copying manifests to staging directory ✓
  • Reading manifests from staging directory ✓
  • Creating Release ✓
    • SEQUENCE: 23
  • Promoting ✓
    • Warning: Release 5.4.0 was promoted to channel "Unstable", but 6.0.0 remains the latest release because the channel is sorted by semver.

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