chore: metricbeat: openai: Implement ReportingMetricSetV2WithContext

[orestisfl]

Proposed commit message

Switches the openai module to ReportingMetricSetV2WithContext to get rid of a context.TODO().

Taking a look in persistcache.go, I see that we probably don't really need any of the two sync.RWMutexes since the only write-able state is in a sync.Map.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

How to test this PR locally

Related issues

• Related [beatreceiver] replace global path in metricbeat openai module #46987

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