MongoDB - update semantic convention to v1.39.0

[Kielek]

Feature Request

Are you requesting automatic instrumentation for a framework or library? Please describe.

• Existing MongoDB instrumentation

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

Outdated semantic convetnion

Describe the solution you'd like
Instrumentation follows https://github.com/open-telemetry/semantic-conventions/blob/v1.39.0/docs/db/mongodb.md
ActivitySource should also provide link to the schema open-telemetry/opentelemetry-dotnet-contrib#3680

Describe alternatives you've considered
N/A

Additional context
N/A

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[aviralgarg05]

I would like to solve the issue, please assign me

[Kielek]

Moving to 1.15.0. There is couple of fixes needed in the PR. No blocker for 1.14.0