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

[baronfel]

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/<COMMAND>[/<SUBCOMMAND>]

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

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Additional context

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