[release/7.0][mono] Backport offsets-tool fixes for Xcode 15 compatibility #93543
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Fixes #93009
Backports relevant parts of #88261, #86256 and #87190
Customer Impact
Our official macOS builds in release/7.0 use an older Xcode for creating .NET 7 packages, but if we bump to a macOS build image which has Xcode 15 the mono build would fail because Xcode 15 contains some breaking changes.
This PR fixes these issues and allows us to build with latest Xcode. We're already using these changes in main and 8.0.
Testing
Manually validated building with Xcode 15.0 works.
Risk
Low, this is a build only change and makes sure we can build with newer Xcode versions.