Remove references to jaeger-agent

[yurishkuro]

Which problem is this PR solving?

• Part of (deprecation) Remove jaeger-agent jaeger#4739

Description of the changes

• Remove references to jaeger-agent everywhere except FAQ and Operator
• Operator page needs to be cleaned-up separately, perhaps it needs changes in the operator to support OTEL Collector as the agent

How was this change tested?

• CI

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