chore(protocol): minor cleanup of ClusterConfig messages; remove DisableTempIndexes option (#10202)

This makes a couple of backwards compatible changes to the
ClusterConfig:

- Remove the `ignore_permissions` and `ignore_delete` booleans which
we've never read or used for anything
- Remove the `disable_temp_indexes` boolean and option entirely. We did
use this one, and about 1% of users have set the option. The only thing
it does is inhibits sending of periodical DownloadProgress messages
while downloading data, which is a minuscule bandwidth optimisation
given that we're already sending data at the time.
- Change the `read_only` boolean (which indicated send-only folders) to
an enum `FolderType`, where the values zero and one match the existing
usage. Again, we don't actually use this value, but I can see that we
might want to and then it makes more sense for it to be more
comprehensive.
- Change the `paused` boolean to an enum `StopReason`, where zero
indicates not stopped and one indicates paused, exactly the same wire
representation as previously but leaves space for additional stop
reasons (errors etc).

go.mod

@@ -41,6 +41,7 @@ require (
 	github.com/urfave/cli v1.22.16
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
 	github.com/willabides/kongplete v0.4.0
+	github.com/wlynxg/anet v0.0.5
 	go.uber.org/automaxprocs v1.6.0
 	golang.org/x/crypto v0.38.0
 	golang.org/x/exp v0.0.0-20250305212735-054e65f0b394
@@ -97,7 +98,6 @@ require (
 	github.com/stretchr/testify v1.10.0 // indirect
 	github.com/tklauser/go-sysconf v0.3.14 // indirect
 	github.com/tklauser/numcpus v0.9.0 // indirect
-	github.com/wlynxg/anet v0.0.5 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	go.uber.org/mock v0.5.2 // indirect
 	golang.org/x/mod v0.24.0 // indirect