fix: display message property for all error instance types

[jsetton]

Issue #, if available:

Description of changes:
Related to #488, I should have included this change as well.

Non-standard Error objects, such as CliWarn and CliError, are being display as stringified object instead of their message property.

[Warn]: {
  "message": "Skill api domain \"smartHome\" cannot be enabled. Skipping the enable process.\n",
  "stack": "CliWarn: Skill api domain \"smartHome\" cannot be enabled. Skipping the enable process.\n\n    at SkillMetadataController.validateDomain (/opt/hostedtoolcache/node/18.17.0/x64/lib/node_modules/ask-cli/dist/lib/controllers/skill-metadata-controller/index.js:106:19)\n    at Object.enableSkill (/opt/hostedtoolcache/node/18.17.0/x64/lib/node_modules/ask-cli/dist/lib/commands/deploy/helper.js:[101](https://github.com/openhab/openhab-alexa/actions/runs/5800707395/job/15759328693#step:6:102):29)\n    at /opt/hostedtoolcache/node/18.17.0/x64/lib/node_modules/ask-cli/dist/lib/commands/deploy/index.js:93:38\n    at processTicksAndRejections (node:internal/process/task_queues:95:5)",
  "detail": {
    "name": "CliWarn"
  }
}

Likewise, SMAPI import status warnings seem to only include a message property. It makes sense to only display that property in that case.

[Warn]: {
  "message": "No interaction model definitions found in the import package for following locales declared in 'publishingInformation' of skill manifest: [\"ar-SA\",\"de-DE\",\"en-US\",\"en-CA\",\"pt-BR\",\"en-IN\",\"es-ES\",\"es-MX\",\"fr-CA\",\"it-IT\",\"hi-IN\",\"en-AU\",\"es-US\",\"fr-FR\",\"en-GB\",\"ja-JP\"]. These locales will not have voice interfaces after successful import."
}

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[doiron]

nice improvement! thanks for the PR!