Unify Nethermind executable name

[rubo]

Changes

This PR unifies the Nethermind executable name as now it's different depending on the installation source. For PPA and Homebrew, it's nethermind while for manual downloads it's Nethermind.Runner. The same issue is with the launcher and CLI.

• Renamed the entrypoint assembly from Nethermind.Runner to nethermind
• Renamed Nethermind.Cli to nethermind-cli
• Renamed Nethermind.Launcher to nethermind-launcher
• Updated existing scripts accordingly
• Added Nethermind.Runner symlink for Linux packages to support the old naming for any existing setup

Before release

• Update PPA: Fix PPA package post-install script #5991
• Update Nethermind launcher: Update Nethermind executable name nethermind.launcher#30
• Update README: Update README #6141

After release

• Update winget manifest
• Update Homebrew formula
• Update docs
• Update eth-docker: Update Nethermind executable name eth-educators/eth-docker#1485
• Update DAppNode
  Update Nethermind executable name dappnode/DAppNodePackage-nethermind#155
  Update Nethermind executable name dappnode/DAppNodePackage-nethermind-xdai#105
  Update Nethermind executable name dappnode/DAppNodePackage-goerli-nethermind#46
• Update Stereum: Update Nethermind executable name stereum-dev/ethereum-node#1412

Types of changes

What types of changes does your code introduce?

• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

Testing

Requires testing

• Yes
• No

If yes, did you write tests?

• Yes
• No

Notes on testing

Needs manual testing.

Documentation

Requires documentation update

• Yes
• No

#5961

Requires explanation in Release Notes

• Yes
• No

The warning to include in all releases in the upcoming months:

⚠️ IMPORTANT

• The Nethermind executable has been renamed from Nethermind.Runner to nethermind
• The Nethermind launcher executable has been renamed from Nethermind.Launcher to nethermind-launcher
• The Nethermind CLI executable has been renamed from Nethermind.Cli to nethermind-cli

Please update your setups accordingly if any.

After a few months, the above warning should be removed together with the symlinks.