Refactor Dialog tests to use fake driver; cleanup config
- Migrated Dialog alignment/layout tests to ViewsTests using FakeDriverBase and a fake driver for improved isolation and parallelization.
- Removed old DialogTests from UnitTests; new tests use explicit disposal and resource management.
- Refactored Dialog static default properties to use auto-properties with [ConfigurationProperty] attributes, removing old backing fields and simplifying code.
- Made DriverAssert public for cross-project test use.
- Removed obsolete test migration and performance analysis markdown docs.
- Improved test infrastructure for future migrations.
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