[release/8.0] [Mono] Fix offset calculation for nested struct, when pinvoke is enabled #91417
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Backport of #91292 to release/8.0
/cc @fanyang-mono
Customer Impact
Prior to this change, the offset of fields was calculated incorrectly for nested struct when PInvoke is enabled. One of the Android customers hit an assertion when build an app.
Testing
Added a new test, which passed on CI.
Validated customer's use case locally. It works correctly now.
Risk
Low risk.