Group7 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 #17108 (fa9949b) into dev (a60c5f0) will increase coverage by 0.00%.
The diff coverage is 87.40%.

@@           Coverage Diff           @@
##              dev   #17108   +/-   ##
=======================================
  Coverage   53.13%   53.14%           
=======================================
  Files        3005     3005           
  Lines       93689    93707   +18     
=======================================
+ Hits        49779    49796   +17     
- Misses      43910    43911    +1     

Impacted Files	Coverage Δ
...ore.Mvc.UI.Theme.Shared/Toolbars/ToolbarManager.cs	94.11% <0.00%> (ø)
...p/Authorization/AlwaysAllowAuthorizationService.cs	69.23% <ø> (ø)
...zation/Permissions/AlwaysAllowPermissionChecker.cs	0.00% <ø> (ø)
...ization/Permissions/PermissionDefinitionContext.cs	47.82% <ø> (ø)
...p/Authorization/Permissions/PermissionGrantInfo.cs	0.00% <0.00%> (ø)
...uthorization/Permissions/PermissionStateContext.cs	0.00% <0.00%> (ø)
...Authorization/AbpAuthorizationServiceExtensions.cs	41.44% <ø> (ø)
...bp/Authorization/AbpAuthorizationPolicyProvider.cs	96.29% <ø> (ø)
...nticatedSimpleStateCheckerSerializerContributor.cs	86.66% <ø> (ø)
...Abp/Authorization/Permissions/PermissionChecker.cs	90.00% <ø> (ø)
... and 56 more

... and 1 file with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more