Proxy version updates

REQUIRES IB 1.7.7+ proxy images

This pins the current envoyfilter to Istio 1.7 and then creates a new envoy filter for 1.8 with the new naming scheme. Also changes to the 1.8 filter include typed config upgrades as well as filter names.

• proxyVersion Support - https://repo1.dso.mil/platform-one/big-bang/apps/core/istio-controlplane/-/merge_requests/29
• BB release with proxy versions - https://repo1.dso.mil/platform-one/big-bang/bigbang/-/blob/release-1.2/chart/values.yaml#L91
• Fixes https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/191

Follows naming scheme istio uses

+ kubectl get envoyfilter -A
NAMESPACE      NAME                        AGE
istio-system   metadata-exchange-1.6       5d18h
istio-system   metadata-exchange-1.7       5d18h
istio-system   stats-filter-1.6            5d18h
istio-system   stats-filter-1.7            5d18h
istio-system   tcp-metadata-exchange-1.6   5d18h
istio-system   tcp-metadata-exchange-1.7   5d18h
istio-system   tcp-stats-filter-1.6        5d18h
istio-system   tcp-stats-filter-1.7        5d18h