Remove opencensus receiver from parsing logic once it is not supported anymore

[iblancasa]

Component(s)

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Is your feature request related to a problem? Please describe.

open-telemetry/opentelemetry-collector-releases#1056 (review)

opentelemetry-operator/internal/components/receivers/single_endpoint_receiver_test.go

Line 60 in 5ddc440

{"opencensus", "opencensus", "__opencensus", 55678, false},

Describe the solution you'd like

.

Describe alternatives you've considered

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Additional context

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