python-fire auto-converts `item1,item2` into a tuple, but if there is a
dash `-` inside the argument, it treats it as a string.
Let's validate the data, when it comes as a `str` or `tuple`.
For more details, here are the tested scenarios:
| --lava-tags= | Type | Value |
|--------------|-------|---------------------|
| None | bool | True |
| '' | str | '' |
| tag1 | str | "tag1" |
| tag1, | tuple | ("tag1",) |
| tag-1,tag-2 | str | 'tag-1,tag-2' |
| tag1,tag2 | tuple | ("tag1", "tag2") |
| ',' | str | ',' |
| ',,' | str | ',,' |
| 'tag1,,' | str | 'tag1,,' |
See also:
https://google.github.io/python-fire/guide/#argument-parsing
Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31882>
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