(AB#270662) Document preview.8 release

[michaeltlombardi]

PR Summary

This change updates the reference documentation and the changelog for the preview.8 release of DSC v3.

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit 33c74c0:

✅ Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-3.0/changelog.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/config/get.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/config/set.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/config/test.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/dsc.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/resource/list.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/resource/schema.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/cli/schema/command.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/config/functions/int.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/config/parameter.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/definitions/resourceKind.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/outputs/config/get.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/outputs/config/set.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/outputs/config/test.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/outputs/resource/list.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/resolve.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/root.md	✅Succeeded	View (dsc-3.0)
dsc/docs-conceptual/dsc-3.0/reference/schemas/resource/manifest/whatif.md	✅Succeeded	View (dsc-3.0)

For more details, please refer to the build report.

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