[roll] Roll fuchsia [ffx][product-bundle] Update fetching to warn instead of bailing

There's been a lot of discussion on various bugs about the current
behavior of bailing when multiple pbms match.

This cl reverts back to the previous default behavior of choosing the
first product-bundle that matches, but adds additional logging to make
it easier to pick a different product-bundle if needed.

This default behavior isn't always what the developer wants, but it's
the most common case for most developers. For instances where the
developer doesn't want to use the pbm returned by this, they can be more
specific in their command invocation using one of the full pbm URLs that
are printed to stdout. In practice that looks something like the
following:

```
> ffx product-bundle get workstation_eng.qemu-x64
Multiple product bundles found for `workstation_eng.qemu-x64`:
`gs://fuchsia/development/9.20220908.3.1/sdk/product_bundles.json#workstation_eng.qemu-x64`
`file:///usr/local/google/home/mjhamrick/fuchsia/out/default/*.json#workstation_eng.qemu-x64`
Defaulting to the first product-bundle in sorted order: `gs://fuchsia/development/9.20220908.3.1/sdk/product_bundles.json#workstation_eng.qemu-x64`
```

If the user doesn't like the default here (for instance, because they
are working in-tree), they can instead provide the full product-bundle
URL to their command. I.e. for `ffx emu start`:

```
> ffx emu start "file:///usr/local/google/home/mjhamrick/fuchsia/out/default/*.json#workstation_eng.qemu-x64"
```

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/725325
Original-Revision: 0e044063de774e4a9721e7da798140932c79593a
GitOrigin-RevId: 6aa1ae8a75bf88cbd1d2c18779a673af91ca3dd0
Change-Id: I86853f136717ab05bce4efd808e2974d15fd118a