Upgrade cadl to 0.40

[chunyu3]

Description

Fix #3117

• upgrade cadl core to 0.40, cadl-azure to 0.26
• update the APIs which are removed
• update the test project cadl files

Checklist

To ensure a quick review and merge, please ensure:

• The PR has a understandable title and description explaining the why and what.
• The PR is opened in draft if not ready for review yet.
  • If opened in draft, please allocate sufficient time (24 hours) after moving out of draft for review
• The branch is recent enough to not have merge conflicts upon creation.

Ready to Land?

• Build is completely green
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• At least one +1 review by a CODEOWNER
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