[BUG] local options affects sharedOptions defined in Dataset.spec.mounts when using ThinRuntime

[TrafalgarZZZ]

What is your environment(Kubernetes version, Fluid version, etc.)
Fluid master version.

Describe the bug
When trying to mount multiple mount points within one Dataset, there are two levels of options for different mount points: mountpoint-level options(i.e. Dataset.spec.mounts[*].options) and dataset-level options (i.e. Dataset.spec.sharedOptions).

mountpoint-level options are defined in each Dataset.spec.mounts[*] so they should override the Dataset.spec.sharedOptions. However, mountpoint-level options affect options defined in other mounts which is not expected.

For instance like:

kind: Dataset
spec:
  sharedOptions:
    foo: bar1
  mounts:
  - mountPoint: test1
    name: test1
    path: /test1
  - mountPoint: test2
    name: test2
    path: /test2
    options:
      foo: bar2

So the options for "test1" should be foo=bar1 and the options for "test2" should be foo=bar2. However, the configmap looks like:

apiVersion: v1
data:
  config.json: '{"mounts":[{"mountPoint":"test1","options":{"foo":"bar2"},"name":"test1","path":"/test1"},{"mountPoint":"test2","options":{"foo":"bar2"},"name":"test2","path":"/test2"}],"targetPath":"/runtime-mnt/thin/default/test/thin-fuse","accessModes":["ReadOnlyMany"]}'
kind: ConfigMap

where options for both "test1" and "test2" are foo=bar2.

What you expect to happen:
mountpoint-level options should not affect options defined in Dataset.spec.sharedOptions

How to reproduce it

Additional Information