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Adjust nginx agent backoff settings and revert request timeout (#3820) (#3828)

Cherry-pick #3820 Problem: As a result to NGINX Agent adding a wait for nginx workers to reload before updating nginx configuration, any long-lived connections would result in an excessively long wait between updating nginx configurations. This cause delays in NGF and on NGINX Plus, could cause a dropping of traffic if there was a wait between updating the configuration and updating the NGINX Plus upstreams. Solution: Adjust the NGINX Agent reload configuration to lower the maximum wait time. Reverted the test request timeout duration back to 10 seconds. Testing: Ran the SnippetsFilter functional test a couple of times and verified when there was a long-lived connection blocking on of the test cases, it went from a 27 second timeout -> 3 second. Also deployed nginx and verified the agent configuration was in there.

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internal/controller/provisioner
- templates.go

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`‎internal/controller/provisioner/templates.go‎`

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Original file line number	Diff line number	Diff line change
`@@ -89,4 +89,13 @@ collector:`
`89`	`89`	`"ngf":`
`90`	`90`	`receivers: ["host_metrics", "nginx_metrics"]`
`91`	`91`	`exporters: ["prometheus"]`
`92`		-{{- end }}`
	`92`	`+{{- end }}`
	`93`	`+data_plane_config:`
	`94`	`+ nginx:`
	`95`	`+ reload_backoff:`
	`96`	`+ initial_interval: .5s`
	`97`	`+ max_interval: 1.5s`
	`98`	`+ max_elapsed_time: 3s`
	`99`	`+ randomization_factor: 0.5`
	`100`	`+ multiplier: 1.5`
	`101`	+`

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Commit d42d0fb

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`‎internal/controller/provisioner/templates.go‎`

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