chore(ci): Break up e2e tests (#6169)

This commit moves test definitions around and doesn't meaningfully
change them. The main change worth noting is that the `basicPrune`
and `explicitDepPrune` pipeline fixtures were running all 8 tests
with yarn. After this change they are only running the relevant prune
tests (both from a root directory and when the monorepo is nested
in a subdirectory). The extra tests are removed, because the changed
pipeline definition does not meaningfully test anything different in 
turbo run commands.

turborepo-tests/e2e/fixtures.ts

@@ -0,0 +1,63 @@
+export const basicPipeline = {
+  pipeline: {
+    test: {
+      dependsOn: ["^build"],
+      outputs: [],
+    },
+    lint: {
+      inputs: ["build.js", "lint.js"],
+      outputs: [],
+    },
+    build: {
+      dependsOn: ["^build"],
+      outputs: ["dist/**", "!dist/cache/**"],
+    },
+    "//#build": {
+      dependsOn: [],
+      outputs: ["dist/**"],
+      inputs: ["rootbuild.js"],
+    },
+    "//#special": {
+      dependsOn: ["^build"],
+      outputs: ["dist/**"],
+      inputs: [],
+    },
+    "//#args": {
+      dependsOn: [],
+      outputs: [],
+    },
+  },
+  globalEnv: ["GLOBAL_ENV_DEPENDENCY"],
+};
+
+export const prunePipeline = {
+  ...basicPipeline,
+  pipeline: {
+    ...basicPipeline.pipeline,
+    // add some package specific pipeline tasks to test pruning
+    "a#build": {
+      outputs: ["dist/**", "!dist/cache/**"],
+    },
+    "c#build": {
+      outputs: ["dist/**", "!dist/cache/**"],
+    },
+  },
+};
+
+export const explicitPrunePipeline = {
+  ...basicPipeline,
+  pipeline: {
+    ...basicPipeline.pipeline,
+    // add some package specific pipeline tasks to test pruning
+    "a#build": {
+      dependsOn: ["b#build"],
+      outputs: ["dist/**", "!dist/cache/**"],
+    },
+    "b#build": {
+      outputs: ["dist/**", "!dist/cache/**"],
+    },
+    "c#build": {
+      outputs: ["dist/**", "!dist/cache/**"],
+    },
+  },
+};