Use capitalizations-path flag in semconvgen to properly capitalize semantic conventions

[carrbs]

Semantic conventions for metrics were introduced in v1.24.0. Additionally, a flag was added to the semconvgenbuild tool providing a way to customize the capitalization of a specific string.

Update the Makefile to utilize the new flag in semconvgen to properly capitalize ASPNETCore and JVM:

opentelemetry-go/Makefile

Line 271 in a9ccdca

$(SEMCONVGEN) -i "$(OTEL_SEMCONV_REPO)/model/." --only=metric -f metric.go -t "$(SEMCONVPKG)/metric_template.j2" -s "$(TAG)"

The issue in the build tools repository has a detailed example.