remote: allow --http-proxy for remote clients

[Luap99]

The remote client should be allowed to specify if the container should be run with the proxy env vars. It will still use the proxy vars from the server process and not the client. This makes podman-remote more consistent with the local version and easier to use in environments where a proxy is required.

Fixes #16520

Does this PR introduce a user-facing change?

podman-remote build set `--http-proxy` to true by default to match the other commands.

[openshift-ci]

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[Luap99]

@sstosh PTAL since you changed some test with that recently.

[rhatdan]

LGTM

[sstosh]

• system/070-build.bats
  --http-proxy is no longer needed.
  Related to system tests: fix a system test in proxy environment #16439

https://github.com/containers/podman/blob/30caf127c00dbc073f29b68f0b3b75c4a7a7015d/test/system/070-build.bats#L23

• e2e/run_env_test.go
  Should os.Setenv("http_proxy", "127.0.0.2") be added here like podman build http proxy test?

https://github.com/containers/podman/blob/30caf127c00dbc073f29b68f0b3b75c4a7a7015d/test/e2e/run_env_test.go#L130-L133

[Luap99]

@sstosh Thanks, I changed those two as well.

[rhatdan]

@flouthoc @giuseppe @vrothberg PTAL
@containers/podman-maintainers PTAL

[vrothberg]

/lgtm