port: Add AllowedSkillsClaimsValidator for Issue 5285 (#5684)

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The changes in Add AllowedSkillsClaimsValidator for Issue 5285 (#5684) may need to be ported to maintain parity with microsoft/botbuilder-dotnet.

Fixes #5285

Description

Added AllowedSkillsClaimsValidator as needed to support skills in the AdaptiveRuntime so that allowedCallers are inferred correctly and validated from the configured skills.

Specific Changes

Added AllowedSkillsClaimsValidator and add it as a singleton as an AuthenticationConfiguration in AddBotRunTimeSkills in ServiceCollectionExtensions.cs.

Because AllowedSkillsClaimsValidator originally was part of the samples/test code and not part of the SDK this meant that there was now an ambiguous reference which had to be handled in the test code, and will need to be updated in the samples as well. It is possible to update the samples/test code to no longer have their own copies of the AllowedSkillsClaimsValidator and have them use the SDK version by having them instantiate the SDK version and pass in a list of allowed callers which could be extracted from the current SkillsConfiguration class that they use (also defined locally to the sample/test). It seems when the AllowedCallersClaimsValidator was added to the SDK that the samples/tests were just updated to use the new SDK class, is that what we want to do here as well?

Testing

Tested with bot projects created from Composer that were configured to use the modified SDK code.

Please review and, if necessary, port the changes.