[release/7.0-rc2] [Mono] Restore old code to solve the recent SpanHelpers regressions#75996

jeffhandley merged 5 commits intorelease/7.0-rc2dotnet/runtime:release/7.0-rc2from

backport/pr-75917-to-release/7.0-rc2dotnet/runtime:backport/pr-75917-to-release/7.0-rc2Copy head branch name to clipboard