fix: remove BDN1100 rule as GenericTypeArguments now supports abstract classes

[Wafaamohamed2]

Overview:

           This PR removes the BDN1100 analyzer rule and its associated tests.

Changes:

           - Removed BDN1100 constant from DiagnosticIds.cs.
           - Removed the logic and diagnostic descriptor from BenchmarkClassAnalyzer.cs.
           - Cleaned up the corresponding localized strings in BenchmarkDotNetAnalyzerResources.resx.
           - Removed the outdated unit tests in BenchmarkClassAnalyzerTests.cs.

Context:

           As discussed in #3008, the constraint preventing [GenericTypeArguments] from being used on abstract classes is no longer necessary and has been removed to provide more flexibility for developers.

[Wafaamohamed2]

@dotnet-policy-service agree

[timcassell]

Please update AnalyzerReleases.Unshipped.md with the removed rule.

[filzrev]

BenchmarkDotNetAnalyzerResources.Designer.cs file also need be updated
(It's automatically updated when save resx file on VS Designer)

Alternatively, it can be resolved with following approach,

1. Add .gitignore settings for *.Designer.cs
2. Remove existing *.Designer.cs file from git repository.

[Wafaamohamed2]

Hi @timcassell and @filzrev, thanks for the feedback.
I've updated the AnalyzerReleases.Unshipped.md with the removed rule and cleaned up the BenchmarkDotNetAnalyzerResources.Designer.cs file.