remove module watcher from subscription

[Shubham8287]

Description of Changes

Problem is visible in replication smoketests, which exit and re-lauch modules, erorring out with:

ERROR /app/public/crates/core/src/host/host_controller.rs:818: Failed to open database: DatabaseError: Database is already opened. Path:`/stdb/data/replicas/4`. Error:Resource temporarily unavailable (os error 11).: Database is already opened. Path:`/stdb/data/replicas/4`. Error:Resource temporarily unavailable (os error 11)

Commented code will be a blocker for releasing Views but we want CIs to pass.

[kim]

I can confirm that it fixes the issue, but it remains unclear why the receiver is not dropped.

[Shubham8287]

ModuleSubscription::module_rx: OnceLock<watch::Receiver<ModuleHost>>,

Here reciever holds the recent instance of ModuleHost and which internally again contains the ModuleSubscriptions, so drop is not being called due to circular dependency.

I am fixing it for View in separate PR.