build: omit d.ts twin from ts build

Without this building exported.js fails because it would overwrite the exported.d.ts in scm

Author: turadg

Diff for: packages/bundle-source/tsconfig.build.json

@@ -7,6 +7,7 @@
     "allowJs": true
   },
   "exclude": [
+    "src/exports.*",
     "test/"
   ]
 }

Diff for: packages/eventual-send/tsconfig.build.json

@@ -7,6 +7,7 @@
     "allowJs": true
   },
   "exclude": [
+    "src/exports.*",
     "test/"
   ]
 }

Diff for: packages/far/tsconfig.build.json

@@ -7,6 +7,7 @@
     "allowJs": true
   },
   "exclude": [
+    "src/exports.*",
     "test/"
   ]
 }