Added header to disabling null bubbling

[tobias-tengler]

TODO:

• We need to check with the Relay team how it's supposed to be implemented.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 76.39%. Comparing base (b87ec6a) to head (0f61372).

Files with missing lines	Patch %	Lines
...re/src/AspNetCore/DefaultHttpRequestInterceptor.cs	25.00%	3 Missing ⚠️
.../src/AspNetCore/DefaultSocketSessionInterceptor.cs	25.00%	3 Missing ⚠️
...src/AspNetCore/Extensions/HttpContextExtensions.cs	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7429      +/-   ##
==========================================
- Coverage   78.48%   76.39%   -2.09%     
==========================================
  Files        2447     2811     +364     
  Lines      120428   141054   +20626     
==========================================
+ Hits        94515   107762   +13247     
- Misses      25913    33292    +7379     

Flag	Coverage Δ
unittests	76.39% <50.00%> (-2.09%)	⬇️

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