Don't follow self, blocks or mute when following all; don't show blocks in list (#4715)

* don't follow self when following all

* also filter blocks

* add more filtering to follow all

* extract logic to functions

src/lib/moderation/blocked-and-muted.ts

@@ -0,0 +1,17 @@
+import {AppBskyActorDefs} from '@atproto/api'
+
+export function isBlockedOrBlocking(
+  profile:
+    | AppBskyActorDefs.ProfileViewBasic
+    | AppBskyActorDefs.ProfileViewDetailed,
+) {
+  return profile.viewer?.blockedBy || profile.viewer?.blocking
+}
+
+export function isMuted(
+  profile:
+    | AppBskyActorDefs.ProfileViewBasic
+    | AppBskyActorDefs.ProfileViewDetailed,
+) {
+  return profile.viewer?.muted || profile.viewer?.mutedByList
+}