[CP #1610 > support/v5.12] [c#] Do not reuse Protobuf message objects in callbacks

[eclipse-ecal-bot]

Cherry-pick failed

Cherry-picked PR #1610 to branch support/v5.12.
The cherry-pick has failed.

The following files have caused conflicts:

lang/csharp/Continental/eCAL/Protobuf/ProtoSubscriber.cs

Resolving

Please resolve conflicts manually. You can use this PR and branch to your convenience.

git fetch origin
git checkout -b local/cherry-pick/419a1d1/support/v5.12 origin/support/v5.12
git branch -u origin/cherry-pick/419a1d1/support/v5.12
git cherry-pick 0bdb60ceef2d0621791ae4950002df50e8430fe5..419a1d1a685866490d6125f6fcc4a95ea1bae0f9

# Resolve conflicts and use
#     git cherry-pick --continue
# until all conflicts are resolved.

git push -f origin HEAD:cherry-pick/419a1d1/support/v5.12

After resolving all conflicts, rebase-merge this PR.