Feature Request: Add proxy to fleet-agent

[ftechmax]

Is your feature request related to a problem?

Currently only the fleet-controller chart has a definition for proxy and noProxy:

        {{- if $.Values.proxy }}
        - name: HTTP_PROXY
          value: {{ $.Values.proxy }}
        - name: HTTPS_PROXY
          value: {{ $.Values.proxy }}
        - name: NO_PROXY
          value: {{ $.Values.noProxy }}
        {{- end }}

Our use-case has downstream clusters within networks that disallow most outbound traffic so this proxy config would be very useful to have for fleet-agent.

Solution you'd like

Add the same proxy values setting from the fleet-controller deployment to the fleet-agent deployment.

Alternatives you've considered

No response

Anything else?

The proxy and noProxy settings do not appear in the fleet-docs repository. If I want to create a PR for this issue do we want this in the docs or keep it as an undocumented feature?