[202205] Fix device type and add cluster in DEVICE_NEIGHBOR_METADATA yang model #17251
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Why I did it
This is the cherry-pick PR for #17049.
The current DEVICE_NEIGHBOR_METADATA yang model has two issues that would block GCU operation when it checks if the current config aligns with the YANG model:
Work item tracking
How I did it
Add cluster field in DEVICE_NEIGHBOR_METADATA YANG model. Change device type to string.
Fix the UT test accordingly.
How to verify it
Build the image and verify the unit tests passed.
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)