[csharp][generichost] Add HTTP client name to fix client duplicity

[McMlok]

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I add HTTP Client name to prevent duplicit client registration if final application reference two or more generated APIs which contains API with same name. HTTP Client registration use only type name not full name including namespace. This fixes #22082

@mandrean, @shibayan, @Blackclaws, @lucamazzanti, @iBicha

[devhl-labs]

Interesting change. I think its ok as long as the checks pass.

[McMlok]

Sorry for dumb question. Is there anything I have to do? Github Action pass on last commit, first has a problem with wrong white spaces and samples. And all CircleCI runs also pass. Did I miss something?