Avoid boxing booleans during tracing and when setting bool? properties

[h3xds1nz]

This should be only merged after #10711 so we don't have to unnecessarily add the usings for KnownBoxes.

Gonna draft it for the same reason so that I can do an additional sweep once it is merged.

Description

Avoids boxing booleans in a few more cases than already done in #10628 and #10711.

I didn't opt-in for making a nullable<bool> helper for DPs as its not that prevalent and saves a few bytes.

Customer Impact

Less boxed booleans on the heap, less memory usage.

Regression

No.

Testing

Local build.

Risk

Low.

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes missing coverage. Please review.

Project coverage is 2.98817%. Comparing base (57fe8ac) to head (c6940aa).
Report is 10 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main     #10884          +/-   ##
===================================================
- Coverage   13.48885%   2.98817%   -10.50068%     
===================================================
  Files           3317       3319           +2     
  Lines         664749     664888         +139     
  Branches       74643      74674          +31     
===================================================
- Hits           89667      19868       -69799     
- Misses        572488     644839       +72351     
+ Partials        2594        181        -2413     

Flag	Coverage Δ
Debug	2.98817% <0.00000%> (-10.50068%)	⬇️

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