use daprWorkflowClient instead of daprClient in workflow sample

[MregXN]

Description

Please refer to issue: #1205

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7228406) 66.58% compared to head (a814847) 66.58%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1212 +/- ## ======================================= Coverage 66.58% 66.58% ======================================= Files 171 171 Lines 5752 5752 Branches 628 628 ======================================= Hits 3830 3830 Misses 1772 1772 Partials 150 150 ``` | [Flag](https://app.codecov.io/gh/dapr/dotnet-sdk/pull/1212/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dapr) | Coverage Δ | | |---|---|---| | [net6](https://app.codecov.io/gh/dapr/dotnet-sdk/pull/1212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dapr) | `66.57% <ø> (ø)` | | | [net7](https://app.codecov.io/gh/dapr/dotnet-sdk/pull/1212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dapr) | `66.57% <ø> (ø)` | | | [net8](https://app.codecov.io/gh/dapr/dotnet-sdk/pull/1212/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dapr) | `66.57% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dapr#carryforward-flags-in-the-pull-request-comment) to find out more.

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