Split reads for new group and instance Microsoft Applications tables

Andrew Evansrequested to merge
495500-atevans-split-microsoft-applications-table-reads into master

What does this MR do and why?

Split reads for new group and instance Microsoft Applications tables

We've recently completed a data migration for the system_access_microsoft_applications table and related tables. This MR implements the second half of the transition to the two tables, allowing reading off the new table for specific groups, controlled by a feature flag.

During the transition, new records and updates to the Microsoft Applications table are written to both new and legacy tables, so we can seamlessly enable and disable the feature flag. When the transition is complete, we can remove the feature flag and drop the legacy data.

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Related to #495500 (closed)

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