Fix broken example `dapr`

[lonegunmanb]

Describe your changes

As #41 described, we've created duplicated log analytics workspace in example/dapr, but somehow the main branch could pass the e2e test but the same issue blocked #38. This pr fixed this issue by setting var.log_analytics_workspace_name an optional variable, and pass var.log_analytics_workspace in example/dapr.

Issue number

000

Checklist before requesting a review

• [ ] The pr title can be used to describe what this pr did in CHANGELOG.md file
• [ ] I have executed pre-commit on my machine
• [ ] I have passed pr-check on my machine

Thanks for your cooperation!