fix(amazonq): make modelId optional in CodeReview

[BlakeLazarine]

Problem

There are some cases where the session.modelId field is empty. When this happens, code review tool was failing unnecessarily. If modelId is null for us, then there is no issue

Solution

mark modelId as optional in schema

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.93%. Comparing base (961e6ca) to head (e2ddb13).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2362   +/-   ##
=======================================
  Coverage   59.93%   59.93%           
=======================================
  Files         258      258           
  Lines       58244    58244           
  Branches     3553     3553           
=======================================
  Hits        34907    34907           
  Misses      23271    23271           
  Partials       66       66           

Flag	Coverage Δ
unittests	59.93% <100.00%> (ø)

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