Fix license_id metric

What does this MR do and why?

Describe in detail what your merge request does and why.

With this MR we fix the lincence_id instrumentation configuration

• We should use ::License.current.license_id method
• The license_id should be allowed in LicenseMetric instrumentation class
• Use LicenseMetric metric in usaga_data.rb

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How to set up and validate locally

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Make sure you have a license for the environment where this is tested

# When using usgae_data.rb

Gitlab::UsageData.license_usage_data[:license_id]

# When using  instrumentation classes only

Gitlab::UsageDataMetrics.uncached_data[:license_id] 

Both values should equal License.current.license_id

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.