fix substrate-node-template generation (#2050)

# Description

This PR updates the node-template-release generation binary as well as
the `node-template-release.sh` file so that we can automatically push
updates to the [substrate-node-template
repository](https://github.com/substrate-developer-hub/substrate-node-template).
I assume this part was not updated after the substrate project has been
moved into the polkadot-sdk mono repo.

# Adjustments
- extend the `node-template-release.sh` to support the substrate
child-folder
- update the `SUBSTRATE_GIT_URL`
- fix the Cargo.toml filter (so that it does not include any
non-relevant .toml files)
- set the workspace-edition to 2021

# Note
In order to auto-generate the artifacts [this
line](https://github.com/paritytech/polkadot-sdk/blob/master/.gitlab/pipeline/build.yml#L320C15-L320C15)
needs to be included in the build.yml script again. Since I do not have
access to the (probably) internal gitlab environment I hope that someone
with actual access can introduce that change.
I also do not know how the auto-publish feature works so that would be
another thing to add later on.

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Co-authored-by: Bastian Köcher <[email protected]>