Deactivating broken CI (#4581)

We should decide on a final location for experimental benchmarks before
moving things around, so as there are currently no changes to that
component, I'm deactivating it.

Dart is not currently needed and I'll have to invest some time into
debugging.

.github/workflows/artifacts-build.yml

@@ -316,7 +316,7 @@ jobs:
           - components/locid_transform
           - components/plurals
           - components/segmenter
-          - experimental/transliterate
+          # - experimental/transliterate
           - experimental/zerotrie
           - provider/blob
           - utils/fixed_decimal
@@ -712,7 +712,7 @@ jobs:
 
   dart-libs:
     name: "Build Dart binaries"
-    if: github.ref == 'refs/heads/main' && github.repository == 'unicode-org/icu4x'
+    if: false && github.ref == 'refs/heads/main' && github.repository == 'unicode-org/icu4x'
     strategy:
       fail-fast: false
       matrix: