Promote Collector default config feature gate to stable

[frzifus]

opentelemetry-operator/pkg/featuregate/featuregate.go

Lines 54 to 59 in ab7ef48

	EnableConfigDefaulting = featuregate.GlobalRegistry().MustRegister(
	"operator.collector.default.config",
	featuregate.StageBeta,
	featuregate.WithRegisterDescription("enables the operator to default the endpoint for known components"),
	featuregate.WithRegisterFromVersion("v0.110.0"),
	)

[Horiodino]

/assign

[swiatekm]

We also need to actually remove the feature gate in the subsequent release.