Add telemetry collection of deployment replica count

[bjee19]

Problem: Want to collect deployment replica count as a telemetry datapoint.

Solution: Collect deployment replica count.

Testing: E2E testing and additional unit tests.

When at 1 replica:

{"level":"debug","ts":"2024-02-08T00:28:47Z","logger":"telemetryJob","msg":"Gathering telemetry data"}
{"level":"debug","ts":"2024-02-08T00:28:47Z","logger":"telemetryJob","msg":"Exporting telemetry data"}
{"level":"debug","ts":"2024-02-08T00:28:47Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ProjectMetadata":{"Name":"NGF","Version":"edge"},"NodeCount":1,"NGFResourceCounts":{"Gateways":0,"GatewayClasses":1,"HTTPRoutes":0,"Secrets":0,"Services":0,"Endpoints":0},"NGFReplicaCount":1}}

When scaled to 3 replicas:

{"level":"debug","ts":"2024-02-08T00:31:48Z","logger":"telemetryJob","msg":"Gathering telemetry data"}
{"level":"debug","ts":"2024-02-08T00:31:48Z","logger":"telemetryJob","msg":"Exporting telemetry data"}
{"level":"debug","ts":"2024-02-08T00:31:48Z","logger":"telemetryExporter","msg":"Exporting telemetry","data":{"ProjectMetadata":{"Name":"NGF","Version":"edge"},"NodeCount":1,"NGFResourceCounts":{"Gateways":0,"GatewayClasses":1,"HTTPRoutes":0,"Secrets":0,"Services":0,"Endpoints":0},"NGFReplicaCount":3}}

Closes #1307

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
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• I have updated necessary documentation
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[kate-osborn]

Left one suggestion that I hope works this time, but I will also approve since the suggestion is not critical.

[pleshakov]

👍