MM-63652: Transition gossip encryption functionality to GA (#33349) (#33429)

Create a new config setting, and migrate the old values to new.

https://mattermost.atlassian.net/browse/MM-63652

Skip-Enterprise-PR: true

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* fix i18n

also fix unit tests

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* For fresh installations, default to true

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* gofmt files

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* Fixing some more strings

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* Update e2e tests

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webapp/platform/types/src/config.ts

@@ -806,7 +806,7 @@ export type ClusterSettings = {
     AdvertiseAddress: string;
     UseIPAddress: boolean;
     EnableGossipCompression: boolean;
-    EnableExperimentalGossipEncryption: boolean;
+    EnableGossipEncryption: boolean;
     ReadOnlyConfig: boolean;
     GossipPort: number;
 };