Restructure Arista-7260CX3-D92C16 hwsku to use common Th2 profile

[neethajohn]

Why I did it

Arista-7260CX3-D92C16 was using incorrect qos template with references since it was not linked to the qos common profiles as other 7260 skus

Work item tracking

• Microsoft ADO : 27595277

How I did it

Linking Arista-7260CX3-D92C16 hwsku to the common 7260 profile

How to verify it

Added unit tests to verify proper buffer and qos template rendering for this sku

Which release branch to backport (provide reason below if selected)

• [ ] 201811
• [ ] 201911
• [ ] 202006
• [ ] 202012
• [ ] 202106
• [ ] 202111
• [ ] 202205
• [ ] 202211
• [x] 202305

Tested branch (Please provide the tested image version)

Unit tests added which will check the rendering part Building an image for 202305: in progress

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