Input Validation for API URL

## Issue Details

**Severity:** High
**Category:** Security
**File Path:** `https://github.com/Cloud-Code-AI/kaizen/blob/main//kaizen/tests/actions/diff_pr_test.py?plain=1#L18`

### Description
Potential for URL manipulation leading to API abuse.

Impact

If user inputs are not validated, it could lead to unauthorized access or data leakage through crafted URLs.

Suggestion

Validate and sanitize inputs for owner, repo, and pr_number before using them in the URL.

Code Sample

```
NA
```

Proposed Solution

```
Use regex or a validation library to ensure inputs conform to expected formats.
```

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