Add remediation description for each issue in the --apply-remediations --preview output

[dhanwanthp]

The preview remediations feature currently does not provide remediation description along with the suggested remediation.

Below is a snippet of the current output structure:

{
      "issueId": "ISSUE-123",
      "status": "available",
      "files": {
        "Example.java": {
          "path": "src/main/java/com/example/Example.java",
          "encoding": "UTF-8",
          "changes": [...]
        }
      },
      "skipReason": null
 }

This fix will add the description field to the output, so the new structure will look like this:

{
      "issueId": "ISSUE-123",
      "status": "available",
      "description": "The code reads a value from a password field and logs it directly...",
      "files": {
        "Example.java": {
          "path": "src/main/java/com/example/Example.java",
          "encoding": "UTF-8",
          "changes": [...]
        }
      },
      "skipReason": null
}

Also, this fix will rename the appliedRemediations field in the output to availableRemediations but only in preview mode. The normal apply-remediations command (without the --preview flag) will have appliedRemediations in its output.