Event Hubs: Remove unused snippets

[christothes]

Please remove these snippets or remove the #region Snippet:<snippet name> or use them in a markdown file.

eventhub: Snippet:EventHubs_ReadMe_ReadPartition
eventhub: Snippet:EventHubs_SamplesCommon_ProducerBasicConfig
eventhub: Snippet:EventHubs_Processor_Sample03_ErrorHandlerExceptionHandling

[jsquire]

Thanks for this! Out of curiosity, how did you mismatch them?

[christothes]

Thanks for this! Out of curiosity, how did you mismatch them?

It's an update to Snippet Generator (and Update-Snippets.ps1) #22090