a7155bc2fa
In preparation for in-memory testing infrastructure, the existing Ivy language service tests are moved to a `legacy` directory. These existing tests rely on a single integration project in `test/project/app`, which presents a number of challenges: * adding extra fields/properties to the integration project for one test can cause others to fail/flake. * it's especially difficult to test any cases that require introducing intentional errors, as those tend to break other tests. * tests load files from disk, which is slower. * tests rely on the real built versions of @angular/core and @angular/common, which makes them both slow to build and require rebuilds on every compiler change. * tests share a single tsconfig.json, making it extremely difficult to test how the language service handles different configuration scenarios (e.g. different type-checking flags). PR Close #39594
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