fix: run module dependency sync off the write action thread (#149)

fix: run module dependency sync off the write action thread

DefaultModuleDependenciesService called syncAllModules() inline from its init block and from rootsChanged(). The IDE delivers rootsChanged from inside a write action (PythonSdkUpdater committing an SDK on startup, via DumbServiceImpl.publishDumbModeChangedEvent), and the collection calls PythonPackageManager.forSdk(), which asserts it is not run in a write action:

IllegalStateException: ‘runBlockingCancellable’ is forbidden in the Write Action because it may start a long-running computation. This can cause UI freezes. Consider running this ‘runBlockingCancellable’ under a read action outside your Write Action

Dispatch the collection onto the service’s own scope and take a read action around it, which is what the assertion asks for. Providers read the project model (SDKs, order entries, VFS children), so the read action is required now that the collection no longer runs on the EDT.

Refs https://github.com/Amazon-Q-Developer/amazon-q-jetbrains/issues/74

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