[MM-36444] Manage config deprecations for 6.0 (#18035)

* removing deprecated stuff

* removing deprecations and marking others for deprecations

* removing some of the configs

* partially remove ExperimentalChannelOrganization

* fixing merge issues

* moving default permissions to defaultroles function

* removing experimentaltownsquare

* removing old tests and remove legacysidebar config

* fixing test

* removing log

* removing unused variables

* MM-36444: Fix for renamed functions.

* MM-36444: go mod tidy and go mod vendor.

* MM-36444: Vendored go modules.

* MM-36444: Removes UseExperimentalGossip config field from model.

* Fix vendors

* fixing test

Co-authored-by: Benjamin Cooke <benjamincooke@Benjamins-MacBook-Pro.local>
Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Martin Kraft <martin@upspin.org>
Co-authored-by: Claudio Costa <cstcld91@gmail.com>

model/role.go

@@ -705,6 +705,13 @@ func MakeDefaultRoles() map[string]*Role {
 			PermissionCreatePost.Id,
 			PermissionUseChannelMentions.Id,
 			PermissionUseSlashCommands.Id,
+			PermissionManagePublicChannelProperties.Id,
+			PermissionDeletePublicChannel.Id,
+			PermissionManagePrivateChannelProperties.Id,
+			PermissionDeletePrivateChannel.Id,
+			PermissionManagePrivateChannelMembers.Id,
+			PermissionDeletePost.Id,
+			PermissionEditPost.Id,
 		},
 		SchemeManaged: true,
 		BuiltIn:       true,
@@ -742,6 +749,10 @@ func MakeDefaultRoles() map[string]*Role {
 			PermissionJoinPublicChannels.Id,
 			PermissionReadPublicChannel.Id,
 			PermissionViewTeam.Id,
+			PermissionCreatePublicChannel.Id,
+			PermissionCreatePrivateChannel.Id,
+			PermissionInviteUser.Id,
+			PermissionAddUserToTeam.Id,
 		},
 		SchemeManaged: true,
 		BuiltIn:       true,
@@ -789,6 +800,8 @@ func MakeDefaultRoles() map[string]*Role {
 			PermissionManageOutgoingWebhooks.Id,
 			PermissionConvertPublicChannelToPrivate.Id,
 			PermissionConvertPrivateChannelToPublic.Id,
+			PermissionDeletePost.Id,
+			PermissionDeleteOthersPosts.Id,
 		},
 		SchemeManaged: true,
 		BuiltIn:       true,
@@ -816,6 +829,7 @@ func MakeDefaultRoles() map[string]*Role {
 			PermissionCreateDirectChannel.Id,
 			PermissionCreateGroupChannel.Id,
 			PermissionViewMembers.Id,
+			PermissionCreateTeam.Id,
 		},
 		SchemeManaged: true,
 		BuiltIn:       true,