Fix Azure binlog upload for large files

Verified.

For documentation, we have 2 new fields in the CR for Azure storage type

• blockSize: Defines the buffer size used during file uploads. The default and minimum value is 1 MiB.

• concurrency: Specifies the maximum number of concurrent uploads for a file. Each upload will allocate a buffer of size BlockSize. The default value is 1.
  
  Note that default and minimum values are enforced by the Azure client used internally, so setting them to values below the minimum values or not setting them at all falls back to the defaults.
  
  e.g.