Adding a more readable error in case Docker not running

[eladm26]

When deploying using a Docker image we get an unclear error in case Docker is not running on the local machine.
Added a more readable error Runtime Exception: Docker is not running. please run docker and try again

Checklist

• This pull request references any related issue by including "closes Improve error message when Docker is not running and Prefect tries to build a Docker image #11802"
  • If no issue exists and your change is not a small fix, please create an issue first.
• This pull request includes tests or only affects documentation.
• This pull request includes a label categorizing the change e.g. maintenance, fix, feature, enhancement, docs.

For documentation changes:

• This pull request includes redirect settings in netlify.toml for files that are removed or renamed.

For new functions or classes in the Python SDK:

• This pull request includes helpful docstrings.
• If a new Python file was added, this pull request contains a stub page in the Python SDK docs and an entry in mkdocs.yml navigation.

[netlify]

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Name	Link
🔨 Latest commit	3b9b976

[discdiver]

Thank you. One suggested change for wording. Will leave to the engineering team for final approval.

[zzstoatzz]

somewhat pedantic comment about wording, just because the user might only see this message through the CLI, so they might not really have "code" to re-run directly.

otherwise, lgtm! 🙂

[zzstoatzz]

thank you @eladm26 for the contribution 🎉