Use deepcopy in RunLogPatch (#14244)
This PR adds deepcopy usage in RunLogPatch.
I included a unit-test that shows an issue that was caused in LangServe
in the RemoteClient.
```python
import jsonpatch
s1 = {}
s2 = {'value': []}
s3 = {'value': ['a']}
ops0 = list(jsonpatch.JsonPatch.from_diff(None, s1))
ops1 = list(jsonpatch.JsonPatch.from_diff(s1, s2))
ops2 = list(jsonpatch.JsonPatch.from_diff(s2, s3))
ops = ops0 + ops1 + ops2
jsonpatch.apply_patch(None, ops)
{'value': ['a']}
jsonpatch.apply_patch(None, ops)
{'value': ['a', 'a']}
jsonpatch.apply_patch(None, ops)
{'value': ['a', 'a', 'a']}
```
