Update Workflow API docs to stable

[antontroshin]

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Description

Update documentation to use stable Workflow API

Issue reference

Related PR: dapr/dapr#8253

[hhunter-ms]

The notes in the Workflow docs about Workflow being in beta also need removed:

• All the docs in Developing applications/Building blocks/Workflow section
• The API reference doc

Does the code snippet for the actor workflow backend need updated?: https://docs.dapr.io/reference/components-reference/supported-workflow-backend/actor-workflow-backend/

SDK docs and code snippets need updated as well, from each sdk repo:

• .NET
• Java
• JS
• Python

[github-actions]

Stale PR, paging all reviewers

[antontroshin]

Closing this PR for now, as the Workflows API in runtime will be deprecated and likely removed in the next releases.
Replaced by Workflows Client.

• Mark Workflow API Alpha as deprecated dapr#8299

[msfussell]

This should not be closed. The docs need to show the final stable API. The beta API will be left there, but we will not mention this, only for transient compatibility until the v1.16 release.

[hhunter-ms]

merging this - @antontroshin I can address the rest of the workflow going stable updates mentioned in the comment above

[antontroshin]

@hhunter-ms @msfussell This PR merge should be reverted.
There's no Stable API update for Workflows /v1.0/workflow in the 1.15 release, as the entire workflow usage is now done through a separate Workflow Client.
As per support policy, the "old" /v1.0-beta1/workflow stays for a few releases until SDKs catch up in the new Workflow Client support implementation. Documentation, examples, and quickstarts for the new Workflow Client, are being updated in separate PRs.