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ARROW-14408: [Packaging][Crossbow] Option for skipping artifact pattern validation

Only download the artifacts belonging to the `manylinux` tasks but without validating the expected artifact names:

```
archery crossbow download-artifacts --no-fetch release-6.0.0-rc1-0 --task-filter "*manylinux*" --skip-pattern-validation
```

`--task-filter`: useful to restrict the download script for certain tasks
`--skip-pattern-validation`: occasionally useful, like in the current case where the manylinux2014 wheels names now contain two platform tags

cc @kou

Closes #11490 from kszucs/crossbow-pattern-validation

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>