chore: delay php-fpm service restart upon configuration update

[igolman]

Description

This resolves unneeded subsequent restarts of phpX.Y-fpm service upon FPM pool configuration update.
If more than 5 FPM pools are affected of a configuration change, systemd will fail to restart the service with following error:

php8.1-fpm.service: Start request repeated too quickly.
php8.1-fpm.service: Failed with result 'start-limit-hit'.
Failed to start The PHP 8.1 FastCGI Process Manager.

Although according to chef resource documentation the default value for the :timer is :delayed, it seems not to be the case and should be explicitly set.
This behavior may be observed at the github's regressions tests

Issues Resolved

• 160

Check List

• A summary of changes made is included in the CHANGELOG under ## Unreleased
• New functionality includes testing.
• New functionality has been documented in the README if applicable.

[damacus]

Nice simple change. Thanks for this.

If there are any unintended consequences like ordering. Let us know, and maybe we can make this configurable

[kitchen-porter]

Released as: 10.2.0