[php-src] Issue #7842: Invalid OpenMetrics response format returned by FPM status page

Issue: https://github.com/php/php-src/issues/7842 Author: ste93cry ### Description PHP 8.1 introduced support in the FPM SAPI for the OpenMetrics format when requesting the status of FPM. While trying to scrape the metrics using Prometheus, I get the following error: data does not end with # EOF. According to the [specs](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md#abnf) in fact, each exposition must end with a # EOF line followed by an optional end of line character when the Content-Type of the response is application/openmetrics-text ### PHP Version PHP 8.1.1 ### Operating System _No response_