Unpack networking yamls

[Priyansurout]

Fixes #14326

Proposed Changes

By folding the networking repository onto the Serving repository, i have removed the need for symlinks across repositories.
Release Note

NONE

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Priyansurout
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[knative-prow]

Hi @Priyansurout. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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