Avoid storing file reference on OciArtifactReference

[anthony-c-martin]

The goal for this PR is just to allow #19453 to use IModuleDispatcher directly, rather than having to duplicate some of the registry logic

[github-actions]

Test this change out locally with the following install scripts (Action run 24840885874)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 24840885874

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 24840885874"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 24840885874

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 24840885874"