For MCP tools that have an input that is a flat list, eg 

```
{
  'items': ['item', 'item']
}
```

The original code led to an invalid pydantic schema like this: 

```
{
    'items': {'items': {}, 'type': 'array'},
    'type': 'array'
}
```

Now the schema is correctly created like this:

```
{
    'items': {'type': 'string'},
    'type': 'array'
}
```

Confirmed the fix using a JIRA MCP tool.

Closes NVIDIA#342 

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AIQToolkit/blob/develop/docs/source/resources/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Sean Lopp (https://github.com/slopp)
  - Anuradha Karuppiah (https://github.com/AnuradhaKaruppiah)

Approvers:
  - Anuradha Karuppiah (https://github.com/AnuradhaKaruppiah)

URL: NVIDIA#346

For MCP tools that have an input that is a flat list, eg 

```
{
  'items': ['item', 'item']
}
```

The original code led to an invalid pydantic schema like this: 

```
{
    'items': {'items': {}, 'type': 'array'},
    'type': 'array'
}
```

Now the schema is correctly created like this:

```
{
    'items': {'type': 'string'},
    'type': 'array'
}
```

Confirmed the fix using a JIRA MCP tool.

Closes NVIDIA#342 

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AIQToolkit/blob/develop/docs/source/resources/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Sean Lopp (https://github.com/slopp)
  - Anuradha Karuppiah (https://github.com/AnuradhaKaruppiah)

Approvers:
  - Anuradha Karuppiah (https://github.com/AnuradhaKaruppiah)

URL: NVIDIA#346