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+// ReplaceAllRequestParameters generates a new set of requests by replacing each parameter's value with the provided payload.
+//
+// This function iterates over all parameters in the given request and creates a new request for each parameter,
+// replacing its value with the specified payload. The resulting requests are returned as a slice, leaving the original
+// request unmodified.
+//
+// Parameters:
+//   - req (models.CrawlRequest): The original CrawlRequest containing parameters to be processed.
+//   - payload (string): The value to replace each parameter's value.
+//
+// Returns:
+//   - ([]models.CrawlRequest): A slice of new CrawlRequest instances, each with one parameter's value replaced by the payload.
+//   - (error): An error if any issue occurs during processing.
+//
+// Notes:
+//   - A new request is created for every parameter in the original request.
+//   - The function is side-effect free and does not modify the original `CrawlRequest`.