Rely on upstream confmap implementation to expand env variables #5206
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After recent changes in the collector core, we can rely on the upstream to expand environmental variables along with $$ escaping. Unfortunately, we cannot do that for the
config_sources
section as it's custom for our distro. So we need to split the behavior for a while to unblock the 0.107.0 release.This change also fixes the
$$
expansion bug. See the corrected test data forTestExpandedDollarSignsViaEnvConfigSource
, which previously validate invalid behavior.Later, we can refactor it further and migrate the config sources to the config providers to be handled upstream, significantly reducing the amount of code we maintain.