Remove tabmanager from metapackage.

packages/metapackage/package.json

@@ -103,7 +103,6 @@
     "@jupyterlab/statedb": "^3.0.0-beta.4",
     "@jupyterlab/statusbar": "^3.0.0-beta.4",
     "@jupyterlab/statusbar-extension": "^3.0.0-beta.4",
-    "@jupyterlab/tabmanager-extension": "^3.0.0-beta.4",
     "@jupyterlab/terminal": "^3.0.0-beta.4",
     "@jupyterlab/terminal-extension": "^3.0.0-beta.4",
     "@jupyterlab/theme-dark-extension": "^3.0.0-beta.4",

packages/metapackage/tsconfig.json

@@ -219,9 +219,6 @@
     {
       "path": "../statusbar-extension"
     },
-    {
-      "path": "../tabmanager-extension"
-    },
     {
       "path": "../terminal"
     },