[WIP] [DNM] Testing only Perf improvement: egress ip/qos reroute rules

[trozet]

These things were constantly being executed on every node update. Bring them inline with what we do for other node syncs, keep a cache of what needs to be sync'ed. The impact of this was especially bad for UDN.

📑 Description

Fixes #

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• if so, I have updated the documentation as required
• My code requires tests
• if so, I have added and/or updated the tests as required
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[openshift-ci]

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[mohit-sheth]

/test qe-perfscale-aws-ovn-small-udn-density-l3

[openshift-ci]

@trozet: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-ovn-upgrade	da830b9	link	true	/test e2e-aws-ovn-upgrade
ci/prow/security	da830b9	link	false	/test security
ci/prow/e2e-vsphere-ovn	da830b9	link	false	/test e2e-vsphere-ovn
ci/prow/e2e-azure-ovn	da830b9	link	false	/test e2e-azure-ovn
ci/prow/e2e-aws-ovn-windows	da830b9	link	true	/test e2e-aws-ovn-windows
ci/prow/e2e-metal-ipi-ovn-ipv4-bgp-techpreview	da830b9	link	false	/test e2e-metal-ipi-ovn-ipv4-bgp-techpreview
ci/prow/e2e-gcp-ovn	da830b9	link	true	/test e2e-gcp-ovn
ci/prow/e2e-metal-ipi-ovn-ipv6-techpreview	da830b9	link	false	/test e2e-metal-ipi-ovn-ipv6-techpreview

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