feat: allow setting otelcol image globally #3051
Merged
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Add a new config value for setting otelcol image for all components:
I've also set all the component-specific settings to be empty and the underlying resources will use the default image in this case.
This is implemented with some rather mundane template functions. Most of the added lines are goldenfile tests I've added, that really should've been there to begin with.
Fixes #2700
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