fix: do not diagnostic property not found if target is read only

[latonz]

Closes #329

[codecov-commenter]

Codecov Report

Merging #345 (9e176b8) into main (dce4b42) will increase coverage by 0.22%.
The diff coverage is 92.14%.

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@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
+ Coverage   91.71%   91.93%   +0.22%     
==========================================
  Files         109      121      +12     
  Lines        3379     3833     +454     
  Branches      438      520      +82     
==========================================
+ Hits         3099     3524     +425     
- Misses        189      210      +21     
- Partials       91       99       +8     

Impacted Files	Coverage Δ
src/Riok.Mapperly.Abstractions/MapEnumAttribute.cs	100.00% <ø> (ø)
...berMappings/MemberNullDelegateAssignmentMapping.cs	57.14% <0.00%> (ø)
.../Mappings/NewInstanceObjectFactoryMemberMapping.cs	100.00% <ø> (ø)
...Mapperly/Descriptors/UserMethodMappingExtractor.cs	98.38% <50.00%> (ø)
...riptors/MappingBuilders/QueryableMappingBuilder.cs	68.42% <68.42%> (ø)
...Descriptors/Mappings/EnumFromStringParseMapping.cs	73.68% <73.68%> (ø)
...ptors/Mappings/MemberMappings/NullMemberMapping.cs	76.27% <76.27%> (ø)
src/Riok.Mapperly/Symbols/FieldMember.cs	78.57% <78.57%> (ø)
src/Riok.Mapperly/Symbols/PropertyMember.cs	78.57% <78.57%> (ø)
...lders/NewInstanceObjectMemberMappingBodyBuilder.cs	80.17% <80.17%> (ø)
... and 57 more

... and 1 file with indirect coverage changes

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[github-actions]

🎉 This PR is included in version 2.8.0-next.2 🎉

The release is available on:

• GitHub release
• v2.8.0-next.2

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