fix: Avoid crash in telemetry on module removal

[radeksimko]

I was able to reproduce this by removing a folder from a workspace, but I also noticed that the VS Code client in particular sends shutdown to the server instead of didChangeWorkspaceFolder with the removed folder, so we can't really track module removals yet until that client-side bug is addressed.

terraform-ls/internal/state/module.go

Lines 252 to 255 in 055cf02

	txn.Defer(func() {
	oldMod := oldObj.(*Module)
	go s.ChangeHooks.notifyModuleChange(oldMod, nil)
	})

I also noticed that the notifications for folder change would never work because we weren't passing the module manager down to the handler, so it would always error out 🙈 This was there since the beginning #502

[dbanck]

LGTM

[github-actions]

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