[release/7.0] [mono] Assert that we don't need to inflate types when applying DIM overrides #74519
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Backport of #74379 to release/7.0
/cc @lambdageek
Fixes #70190
Customer Impact
Customer code that depends on generic interfaces with default implementations does not crash.
Testing
CI and manual testing
Risk
Moderate - there is no good workaround if any of the new asserts fail.
IMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.