Testing how doxygen treats expansion of a macro with the final keyword.

[ahsonkhan]

Following-up on #5331 (comment) to investigate if this is purely a doxygen bug/limitation.

[ahsonkhan]

Looks like doxygen has a bug here:
https://dev.azure.com/azure-sdk/public/_build/results?buildId=3485543&view=logs&j=a7bbfb1e-9b1d-5480-b954-b42b4949e5ba&t=096ff1de-ad77-5a07-f98a-aae88a25dd53

2024-02-09T23:07:22.3799516Z D:/a/_work/1/s/sdk/identity/azure-identity/inc/azure/identity/azure_cli_credential.hpp(53): error : explicit link request to 'Azure::Identity::AzureCliCredentialOptions' could not be resolved [D:\a\_work\1\s\build\sdk\identity\azure-identity\azure-identity-docs.vcxproj]
2024-02-09T23:07:22.3801136Z D:/a/_work/1/s/sdk/identity/azure-identity/inc/azure/identity/azure_cli_credential.hpp(53): error : explicit link request to 'Azure::Identity::AzureCliCredentialOptions' could not be resolved [D:\a\_work\1\s\build\sdk\identity\azure-identity\azure-identity-docs.vcxproj]
2024-02-09T23:07:22.3802481Z D:/a/_work/1/s/sdk/identity/azure-identity/inc/azure/identity/azure_cli_credential.hpp(21): error : Member _azure_NON_FINAL_FOR_TESTS (macro definition) of file azure_cli_credential.hpp is not documented. [D:\a\_work\1\s\build\sdk\identity\azure-identity\azure-identity-docs.vcxproj]
2024-02-09T23:07:22.3803886Z D:/a/_work/1/s/sdk/identity/azure-identity/inc/azure/identity/azure_cli_credential.hpp(53): error : explicit link request to 'Azure::Identity::AzureCliCredentialOptions' could not be resolved [D:\a\_work\1\s\build\sdk\identity\azure-identity\azure-identity-docs.vcxproj]
...
2024-02-09T23:07:22.4667607Z   Exiting...
2024-02-09T23:07:22.4744602Z C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Microsoft\VC\v170\Microsoft.CppCommon.targets(254,5): error MSB8066: Custom build for 'D:\a\_work\1\s\build\CMakeFiles\78505589f34711cbcadb3f5e17dab275\azure-identity-docs.rule;D:\a\_work\1\s\sdk\identity\azure-identity\CMakeLists.txt' exited with code 1. [D:\a\_work\1\s\build\sdk\identity\azure-identity\azure-identity-docs.vcxproj]
2024-02-09T23:07:22.5372760Z ##[error]Cmd.exe exited with code '1'.
2024-02-09T23:07:22.5636486Z ##[section]Finishing: Generate docs (azure-identity-docs)

Tracking issue: doxygen/doxygen#10641

[ahsonkhan]

/azp run cpp - identity - ci

[ahsonkhan]

/azp run cpp - identity

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