Revert "fix(decorator): replace hard code url with `{endpoint}` in `@scenarioService` (#598)"

[archerzz]

This reverts commit 039ab07e8cc5ee9c7805fd3a656eaebb66260aec.

Cadl Ranch Contribution Checklist:

• [ ] I have written a scenario spec
• [ ] I have meaningful @scenario names. Someone can look at the list of scenarios and understand what I'm covering.
• [ ] I have written a mock API
• [ ] I have used @scenarioDocs for extra scenario description and to tell people how to pass my mock api check.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: c5ebdf87a5c95a6b165fd1cf1d671bc6dc44f1ea

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ------------------------------ | ----- | | @azure-tools/cadl-ranch-expect | Patch | | @azure-tools/cadl-ranch-specs | Patch | | @azure-tools/cadl-ranch | Patch |

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