NGF is reloading NGINX for HTTPRoutes with no accepted Gateway

[ciarams87]

Describe the bug
We are reloading after reconciling a HTTPRoute even when there is no accepted Gateway and no config being generated.

To Reproduce
Steps to reproduce the behavior:

Deploy a HTTPRoute referring to a Gateway that has not yet been created. Observe that NGINX config files are being regenerated and NGINX is reloaded.

Expected behavior
NGINX should not be reloaded when no NGINX config changes have occurred. In this specific case, without any accepted Gateway, we do not write anything new to the http.conf file, meaning there are no changes to be reloaded.

Your environment
GKE cluster:

• Node count: 3
• Instance Type: e2-medium
• k8s version: 1.27.4-gke.900
• Zone: europe-west2-b
• Total vCPUs: 6
• Total RAM: 12GB
• Max pods per node: 110

NGF deployment:

• NGF version: edge - git commit 72b6c6e
• NGINX Version: 1.25.2

Additional context
See #1116