[BUG] Old reports for notebooks does not work

[joshuali925]

Describe the bug
Since notebooks is merged to observability, the URL has changed. Old report definitions created with notebooks no longer work.

To Reproduce
Steps to reproduce the behavior:

1. create report definition for a notebook
2. remove notebook plugin and install observability plugin
3. the report definition does not work

Expected behavior
observability should redirect legacy notebook URL to current URL

Plugins
Please list all plugins currently enabled.

Screenshots
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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
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[joshuali925]

closed by #141