Remove separate uploading of assets from deploy-to-app.yaml

[dskloetd]

Motivation

The nns-dapp wasm is bigger than 2 MB. When the deploy-to-app workflow was created, this meant that the wasm couldn't be installed to an application subnet.
The "real" nns-dapp isn't affected by this because the NNS subnet allows larger messages.
To work around this, a mechanism was implemented to build and install a wasm without assets and upload the assets separately.
This is no longer necessary because the IC now supports uploading the wasm in chunks and then installing the wasm from chunks. dfx also supports this transparently.
So we can simply call dfx to install the large wasm and everything happens correctly behind the scenes.

Changes

1. Remove the calls to split the assets.
2. Install the standard wasm instead of the noassets wasm.
3. Remove the calls to upload the assets.

Tests

https://beta.nns.ic0.app/ is working again because it was installed and upgraded this way:

• reinstall: https://github.com/dfinity/nns-dapp/actions/runs/11125543897
• upgrade: https://github.com/dfinity/nns-dapp/actions/runs/11125814854

Todos

• Add entry to changelog (if necessary).
  not necessary

[mstrasinskis]

Thank you!