addons/packages/pinniped: dedup HTTP proxy env vars

[ankeesler]

These are injected via the upstream _ytt_lib logic.

What this PR does / why we need it

• Deduplicate HTTP proxy env vars in Pinniped package

Before:

        env:
        - name: HTTPS_PROXY
          value: https://example.com
        - name: NO_PROXY
          value: 100.96.0.0/11,100.64.0.0/13,127.0.0.1,localhost,.svc,.svc.cluster.local,
        - name: HTTP_PROXY
          value: http://example.com
        - name: HTTPS_PROXY
          value: https://example.com
        - name: NO_PROXY
          value: 100.96.0.0/11,100.64.0.0/13,127.0.0.1,localhost,.svc,.svc.cluster.local,

After:

        env:
        - name: HTTPS_PROXY
          value: https://example.com
        - name: NO_PROXY
          value: 100.96.0.0/11,100.64.0.0/13,127.0.0.1,localhost,.svc,.svc.cluster.local,

Details for the Release Notes (PLEASE PROVIDE)

Pinniped package 0.12.0 no longer has duplicated HTTP proxy env vars

Which issue(s) this PR fixes

None

Describe testing done for PR

• Deployed this dev package into an existing cluster and saw that HTTP proxy env vars were no longer duplicated

Special notes for your reviewer

None

[benjaminapetersen]

Nifty.