[8.18](backport #6675) resolve proxy to inject using http package #6758
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What does this PR do?
Agent is injecting proxy env variables into components configs if no proxy is already specified by the config. Unfortunately with this approach the NO_PROXY variable is lost, so the target URL has to be evaluated against the environment proxy to determine if the proxy should be used. Go http provides such functionality.
Why is it important?
The environment proxy may be defined with exclusion for Fleet and Output addresses.
Checklist
./changelog/fragments
using the changelog toolRelated issues
HTTP_PROXY/HTTPS_PROXY/NO_PROXY
to components. #2602This is an automatic backport of pull request #6675 done by [Mergify](https://mergify.com).