Add readonly_inputs to dotnet & dotnet_dll templates

[Porges]

Closes #2739

[codecov-commenter]

Codecov Report

Merging #2740 (5ca7865) into main (c1f6dfc) will decrease coverage by 1.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2740      +/-   ##
==========================================
- Coverage   31.54%   29.93%   -1.61%     
==========================================
  Files         199      324     +125     
  Lines       25754    38990   +13236     
==========================================
+ Hits         8123    11671    +3548     
- Misses      17631    27319    +9688     

Impacted Files	Coverage Δ
src/ApiService/ApiService/onefuzzlib/Creds.cs	0.00% <0.00%> (ø)
...c/ApiService/ApiService/OneFuzzTypes/Converters.cs	87.03% <0.00%> (ø)
...rc/ApiService/ApiService/OneFuzzTypes/Validated.cs	83.72% <0.00%> (ø)
src/ApiService/ApiService/HttpClient.cs	0.00% <0.00%> (ø)
...rvice/ApiService/onefuzzlib/TaskEventOperations.cs	7.14% <0.00%> (ø)
...rc/ApiService/ApiService/TestHooks/UriExtension.cs	0.00% <0.00%> (ø)
src/ApiService/ApiService/Functions/ReproVmss.cs	59.52% <0.00%> (ø)
...piService/onefuzzlib/orm/CustomConverterFactory.cs	90.24% <0.00%> (ø)
...ce/ApiService/TestHooks/DiskOperationsTestHooks.cs	0.00% <0.00%> (ø)
...ervice/ApiService/TestHooks/ExtensionsTestHooks.cs	0.00% <0.00%> (ø)
... and 115 more

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