add message of the day for Linux nodes in GA API

[UtheMan]

Data Plane API Specification Update Pull Request

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API Info: The Basics

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Change Scope

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Please share a link to the design document for the new APIs, a link to the previous API Spec document (if applicable), and the root paths that have been updated.}

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Viewing API changes

For convenient view of the API changes made by this PR, refer to the URLs provided in the table
in the Generated ApiView comment added to this PR. You can use ApiView to show API versions diff.

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Tooling

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Helpful Links

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Getting help

• First, please carefully read through this PR description, from top to bottom.
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[openapi-pipeline-app]

Next Steps to Merge

✅ All automated merging requirements have been met! To get your PR merged, see aka.ms/azsdk/specreview/merge.

[openapi-pipeline-app]

Generated ApiView

Language	Package Name	ApiView Link
Go	sdk/resourcemanager/containerservice/armcontainerservice	https://apiview.dev/Assemblies/Review/2f19cca64456411e9c342082a432418f?revisionId=a6f2a6941882428e877a1f36ec4c15b5
JavaScript	@azure/arm-containerservice	https://apiview.dev/Assemblies/Review/dabf043916d14dc38e0c2d456d89f55a?revisionId=feba28ff0c0b4010aed5d6072301220c
Swagger	Microsoft.ContainerService	https://apiview.dev/Assemblies/Review/71d5cd3d2d1c46b59eabc692899ea0b4?revisionId=7f6ee36d234647c5b68cfb3b7aba6c74