Move verify and clear method to tear down method in isis reflectometry unit tests

[yusufjimoh]

Description of work

Move verify and clear to tear down method in isis reflectometry unit tests

Summary of work

• moved verify and clear to tear down method in the following files:
• MainWindowPresenterTest.h
• CatalogRunNotifierTest.h
• QtCatalogSearcherTest.h

Refs: https://github.com/mantidproject/mantid/issues/35956

To test:

Tests should pass.

This does not require release notes because it is a unit test refactor.