Fix sharedState tests and refactor out some shared pages #335
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For several features, the "Page" utility files in the tests were identical, or close enough to be combined. Rather than 7 identical files, we can just share one file.
The shared state tests for the ServerStarterAllFeatures agent were incorrect. That example is hardcoded, so tests have been modified to fix that.
The mastra local agent had an invalid config that was causing shared memory backends across agents. Turns out this is fine using the dynamoDB backend, but not when using the libsql backend. Fixed that as well.