feat(test runner): rework how tsconfig is applied #29882
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Previously, test runner would load tsconfig for each imported file based on its location, going up the directory tree.
Now, test runner mostly uses a single tsconfig for all imported files and respects
files
,include
andexclude
properties to determine whether to apply tsconfig to a particular file or not.For backwards compatibility, root tsconfig is used to load
playwright.config.ts
, but whentestDir
has its own tsconfig, it used for loading all tests instead of the root tsconfig.