Unify metric titles between APM & OTEL

[tkarai]

Relevant information

Unify Throughout, Response time and Error rate golden metric titles between APM and OpenTelemetry service applications. This will make the UI to display the same column names for these two closely related entity types.

Checklist

• I've read the guidelines and understand the acceptance criteria.
• The value of the attribute marked as identifier will be unique and valid.
• I've confirmed that my entity type wasn't already defined. If it is I'm providing an explanation above.

[entityBot]

beep boop bop.

I have found some errors processing these changes:

* Error VALIDATING domainType: 'EXT-PIXIE_DNS' on synthesis - Exception: Synthesis rules match 'EXT-SERVICE' domainType with the given test data: 'MetricRaw.json file - #1' data point. Expecting synthesis rules to match 'EXT-PIXIE_DNS'. Please review test data and synthesis rules.

* Error VALIDATING domainType: 'EXT-PIXIE_DNS' on synthesis - Exception: No entity matches 'EXT-PIXIE_DNS' synthesis rules for the given test data: 'Span.json file - #1' data point. Please review test data and synthesis rules.

Let's validate those changes.

[entityBot]

beep boop bop.

I have found some errors processing these changes:

* Error VALIDATING domainType: 'EXT-PIXIE_DNS' on synthesis - Exception: Synthesis rules match 'EXT-SERVICE' domainType with the given test data: 'MetricRaw.json file - #1' data point. Expecting synthesis rules to match 'EXT-PIXIE_DNS'. Please review test data and synthesis rules.

* Error VALIDATING domainType: 'EXT-PIXIE_DNS' on synthesis - Exception: No entity matches 'EXT-PIXIE_DNS' synthesis rules for the given test data: 'Span.json file - #1' data point. Please review test data and synthesis rules.