Escape markup in case passed argument is class

[Moustafaa91]

fixes #1763

• I have read the Contribution Guidelines
• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
• The documentation was modified to reflect the changes OR no documentation changes are required.

Changes

• Modified Markup.EscapeInterpolated to escape markup in the case passed argument is a class.
• Added unit test to verify the fix.

---

Please upvote 👍 this pull request if you are interested in it.