revert: "chore: skip existing in the pypi upload"

This reverts commit bdcee96.

Reason for revert:

```
ERROR    UnsupportedConfiguration: The configured repository
         'https://us-python.pkg.dev/oss-exit-gate-prod/bigframes--pypi' does not
         have support for the following features: --skip-existing and is an
         unsupported configuration
```

Change-Id: I6b8adf863c5c13b64a40feb7527de6a7f06dd12e
Reviewed-on: https://bigframes-internal-review.git.corp.google.com/c/bigframes/+/4720
Reviewed-by: Shenyang Cai <sycai@google.com>
Kokoro-Docs: Kokoro <noreply+kokoro-dedicatedkokoro-dedicated Kokorogoogle.com>
Kokoro-Doctest: Kokoro <noreply+kokoro-dedicatedkokoro-dedicated Kokorogoogle.com>
Kokoro-Lint: Kokoro <noreply+kokoro-dedicatedkokoro-dedicated Kokorogoogle.com>
Kokoro-System: Kokoro <noreply+kokoro-dedicatedkokoro-dedicated Kokorogoogle.com>
Kokoro-Unit: Kokoro <noreply+kokoro-dedicatedkokoro-dedicated Kokorogoogle.com>

Author: tswast

.kokoro/buildwheel.sh

@@ -44,8 +44,6 @@ done
 
 twine upload \
     --repository-url "https://us-python.pkg.dev/oss-exit-gate-prod/bigframes--pypi" \
-    --skip-existing \
-    --non-interactive \
     --verbose \
     "${artifacts_dir}/*"