#16913: Add Model Updates to the Release assets

[dimitri-tenstorrent]

Ticket

#16913

Problem description

The users would like to know what models changes affect the current release.

What's changed

Added the MODEL_UPDATES.md file that the Models team keeps up-to-date to the Release Assets.
The file's location is: https://github.com/tenstorrent/tt-metal/blob/main/models/MODEL_UPDATES.md

Checklist

• Post commit CI passes
• Package and Release workflow passes -
  https://github.com/tenstorrent/tt-metal/actions/runs/12873666211
  https://github.com/tenstorrent/tt-metal/releases/tag/v0.55.0-rc7
• Blackhole Post commit (if applicable)
• Model regression CI testing passes (if applicable)
• Device performance regression CI testing passes (if applicable)
• (For models and ops writers) Full new models tests passes
• New/Existing tests provide coverage for changes