Create a standardized help url alias and apply it to all bundled commands + subcommands

### Is your feature request related to a problem? Please describe.

For ease of use and predictability we should have a canonical set of aka.ms redirects for online help for the CLI commands. These urls should be of the form

```
https://aka.ms/dotnet/cli/[/]
```

i.e. the stem `https://aka.ms/dotnet/cli`, followed by the `COMMAND` name, followed by zero or more `SUBCOMMAND` parts separated by `/`. We should create this set of links and apply it to DocumentedCommand metadata for all commands that ship in the .NET SDK

### Describe the solution you'd like
A clear and concise description of what you want to happen. Include any alternative solutions you've considered.

### Additional context
This depends on #42161 to unblock subcommand processing in `dotnet help`, but not for creating the per-command help URL aliases.