Enable full DNS names

[jakub-racek-swi]

Description: Expanding the field for the collection of DNS names and by extension workload names in metric labels. The names of workloads can get long, for example if there is a certain service running on a certain pod in a certain namespace all that information gets concatenated into this string. It was limited to 80 characters before, while 256 characters is the actual theoretical limit.

This branch was migrated from https://github.com/open-telemetry/opentelemetry-network/pull/260

Link to tracking Issue: https://github.com/open-telemetry/opentelemetry-network/issues/256

Testing: Manual testing, running in devbox

Documentation: none