azure-ai-projects: configure otel logging in telemetry.enable() helper

[lmolkova]

Fixes #38413

1. OTel gen-ai semconv recommend using otel events (aka logs) to record prompts/completions which is what OpenAI instrumentation does. So we need to enable events (aka logs) too
2. We should not override global tracer or logger if it was configured before, but we can modify it - fixing this
3. Some cosmetic improvements after testing with newly released https://pypi.org/project/opentelemetry-instrumentation-openai-v2

[azure-sdk]

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azure-ai-projects