git: move seen-alias bookkeeping into handle_alias(...)

We are about to complicate the command handling by allowing *deprecated*
builtins to be shadowed by aliases.  We need to organize the code in
order to facilitate that.[1]

The code in the `while(1)` speculatively adds commands to the list
before finding out if it’s an alias.  Let’s instead move it inside
`handle_alias(...)`—where it conceptually belongs anyway—and in turn
only run this logic when we have found an alias.[2]

[1]: We will do that with an additional call to `handle_alias(1)` inside
    the loop.  *Not* moving this code leaves a blind spot; we will miss
    alias looping crafted via deprecated builtin names
[2]: Also rename the list to a more descriptive name

Based-on-patch-by: Jeff King <peff@peff.net>
Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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