test: add test case for matching on page.path when page also has matchPath#39322

pieh wants to merge 1 commit intomastergatsbyjs/gatsby:masterfrom

michalpiechowiak/frb-1754-purina-difference-in-matchpath-file-naming-on-gatsby5120gatsbyjs/gatsby:michalpiechowiak/frb-1754-purina-difference-in-matchpath-file-naming-on-gatsby5120Copy head branch name to clipboard