Group12 Enable nullable annotations

[realLiangshiwei]

Description

Related #16610

Checklist

• I fully tested it as developer / designer and created unit / integration tests
• I documented it (or no need to document or I will create a separate documentation issue)

[codecov]

Codecov Report

Merging #17549 (13ae76d) into dev (3634de2) will decrease coverage by 0.01%.
Report is 9 commits behind head on dev.
The diff coverage is 62.22%.

@@            Coverage Diff             @@
##              dev   #17549      +/-   ##
==========================================
- Coverage   53.56%   53.55%   -0.01%     
==========================================
  Files        3032     3032              
  Lines       94604    94606       +2     
==========================================
- Hits        50670    50669       -1     
- Misses      43934    43937       +3     

Files Changed	Coverage Δ
...lo/Abp/Domain/Repositories/RepositoryExtensions.cs	86.72% <ø> (ø)
...bpDbContextConfigurationContextSqliteExtensions.cs	0.00% <ø> (ø)
...ameworkCore/AbpDbContextOptionsSqliteExtensions.cs	0.00% <ø> (ø)
...yInjection/AbpEfCoreServiceCollectionExtensions.cs	100.00% <ø> (ø)
...eworkCore/DistributedEvents/IncomingEventRecord.cs	0.00% <0.00%> (ø)
...eworkCore/DistributedEvents/OutgoingEventRecord.cs	0.00% <0.00%> (ø)
...ntityFrameworkCore/EfCoreAsyncQueryableProvider.cs	13.43% <ø> (ø)
...FrameworkCore/EntityHistory/EntityHistoryHelper.cs	83.73% <0.00%> (ø)
...rations/EfCoreDatabaseMigrationEventHandlerBase.cs	0.00% <0.00%> (ø)
...re/Modeling/AbpModelBuilderConfigurationOptions.cs	0.00% <0.00%> (ø)
... and 35 more

... and 1 file with indirect coverage changes

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