[R] Don't construct `arrow_binary` class vector in favor of `blob::blob`
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Component: R
Status: needs champion
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
A follow up for #45595
As discussed in #43135, `arrow_binary` class object needs to be deprecated in favor of `blob::blob`.
In the first step, `arrow_binary` objects now inherits `blob::blob` from #45595.
But `arrow_binary` class continues to be used to convert Arrow data to R.
`arrow_binary` class is completely unnecessary from any perspective other than compatibility, so it can be removed and the pure `blob::blob` class can be used.
### Component(s)
R
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