[OpenTelemetry] allow to overwrite provided Resource attributes

[secustor]

To allow users to overwrite our defined resource attributes, we should check if the following environment variables are defined.
If they are unset or empty, our variables should be set.

For the three attributes that would be:

• OTEL_SERVICE_NAME
• OTEL_SERVICE_NAMESPACE ( not officially in specification, but used in e.g. in the Python SDK https://pypi.org/project/opentelemetry_wrapper/)
• OTEL_SERVICE_VERSION ( not implemented Add OTEL_SERVICE_VERSION open-telemetry/opentelemetry-specification#1901 )

Originally posted by @secustor in #28976 (reply in thread)

The code is located here:

renovate/lib/instrumentation/index.ts

Lines 46 to 48 in e7bcf3f

	[SemanticResourceAttributes.SERVICE_NAME]: 'renovate',
	[SemanticResourceAttributes.SERVICE_NAMESPACE]: 'renovatebot.com',
	[SemanticResourceAttributes.SERVICE_VERSION]: pkg.version,

[HonkingGoose]

There's a typo in the issue tile: attributres should be: attributes.