feat(client): Support body placeholder for SSH endpoints (#1286)

* feat(ssh): Add BODY placeholder support for SSH endpoints

- Modify ExecuteSSHCommand to capture stdout output
- Update SSH endpoint handling to use needsToReadBody() mechanism
- Add comprehensive test cases for SSH BODY functionality
- Support basic body content, pattern matching, JSONPath, and functions
- Maintain backward compatibility with existing SSH endpoints

* docs: Add SSH BODY placeholder examples to README

- Add [BODY] placeholder to supported SSH placeholders list
- Add comprehensive examples showing various SSH BODY conditions
- Include pattern matching, length checks, JSONPath expressions
- Demonstrate function wrappers (len, has, any) usage

* Revert "docs: Add SSH BODY placeholder examples to README"

This reverts commit ae93e386833fb71885cab637fc46eb31500cb7c4.

* docs: Add [BODY] placeholder to SSH supported placeholders list

* test: remove SSH BODY placeholder test cases

* Update client/client.go

* Update client/client.go

* docs: Add minimal SSH BODY example

---------

Co-authored-by: TwiN <twin@linux.com>

config/endpoint/endpoint.go

@@ -514,11 +514,16 @@ func (e *Endpoint) call(result *Result) {
 			result.AddError(err.Error())
 			return
 		}
-		result.Success, result.HTTPStatus, err = client.ExecuteSSHCommand(cli, e.getParsedBody(), e.ClientConfig)
+		var output []byte
+		result.Success, result.HTTPStatus, output, err = client.ExecuteSSHCommand(cli, e.getParsedBody(), e.ClientConfig)
 		if err != nil {
 			result.AddError(err.Error())
 			return
 		}
+		// Only store the output in result.Body if there's a condition that uses the BodyPlaceholder
+		if e.needsToReadBody() {
+			result.Body = output
+		}
 		result.Duration = time.Since(startTime)
 	} else {
 		response, err = client.GetHTTPClient(e.ClientConfig).Do(request)