fix(bazel): api extractor don't generate tsdoc metadata (#29023)

tsdoc metadata is not needed for `ng_module` and with `@microsoft/api-extractor` version 7.0.21 there is a new flag to disable it's generation.

See: https://github.com/Microsoft/web-build-tools/issues/1051

PR Close #29023

packages/bazel/package.json

@@ -22,7 +22,7 @@
     "@angular-devkit/core": "^7.0.4",
     "@angular-devkit/schematics": "^7.3.0-rc.0",
     "@bazel/typescript": "^0.26.0",
-    "@microsoft/api-extractor": "^7.0.17",
+    "@microsoft/api-extractor": "^7.0.21",
     "@schematics/angular": "^7.0.4",
     "@types/node": "6.0.84",
     "semver": "^5.6.0",

packages/bazel/src/api-extractor/index.ts

@@ -89,6 +89,9 @@ export function runMain(
       enabled: !!dtsBundleOut,
       publishFolder: dtsBundleOut && path.resolve(path.dirname(dtsBundleOut)),
       mainDtsRollupPath: dtsBundleOut && path.basename(dtsBundleOut),
+    },
+    tsdocMetadata: {
+      enabled: false,
     }
   };