pkg/services/otelhealth: fix uptime_seconds metric type from Gauge to Counter #10250

Job	Run time
detect-modules	3s
lint-module (./pkg/values)	19s
lint-module (./pkg/chipingress)	51s
lint-module (.)	2m 31s
lint-module (./observability-lib)	47s
lint-module (./keystore)	2m 34s
lint-module (./pkg/monitoring)	1m 8s
lint-module (./pkg/workflows/sdk/v2/pb)	24s
golangci-lint	2s
	8m 39s

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