OTEL collector exposes flags that are not used

[pavolloffay]

For instance #2181 introduced all Jaeger collector flags to OTEL build. From the introduced flags only zipkin flags are needed.

From one point of view exposing all flags helps with backward compatibility (for drop-in replacement) - the process will not fail at startup on not recognized flag from Jaeger collector. On the other hand these some flags are noop.

There are two ways to go:
2. mark not used flags as noop/deprecated.

1. remove not used flags

We could do this gradually, first just make them noop and then remove them once Jaeger collector will not be supported anymore.

[pavolloffay]

For now OTEL components expose only flags that are being used.

Done in #2241