remove mesh metric otel from experimental

[johnharris85]

Remove the experimental designation for OTEL in MeshMetric.

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[Automaat]

please add {% if_version gte:2.9.x %} for this change so that we remove experimental only form 2.9.x version

[johnharris85]

Is 2.9 correct? Further down there is:

{% if_version gte:2.7.x %}
#### OpenTelemetry
...

Also in the nav the experimental is gone from 2.7 onwards?

Assuming that's correct (2.7 onwards is out of experimental according to the two places above), I've amended this PR with a guard but for 2.7 (not 2.9).

[Automaat]

@johnharris85 do we have experimental somewhere in nav bar? I cannot find it. I see that you put gte 2.7 I think we should remove experimental only from the newest version. It was experimental in 2.7, and it had some bugs. Also, it will motivate users to use the newest version