Fix align_chunks xarray backcompat + add min version tests

[ianhi]

Fixes: #1298

Initially opening without the fix to check that the new min version tests introduced here would have caught this.

[ianhi]

    
>       self.xarray_store = ZarrStore.open_group(
            store=self.store,
            group=group,
            mode=concrete_mode,
            zarr_format=3,
            append_dim=append_dim,
            write_region=region,
            safe_chunks=self.safe_chunks,
            align_chunks=self.align_chunks,
            synchronizer=None,
            consolidated=False,
            consolidate_on_close=False,
            zarr_version=None,
        )
E       TypeError: ZarrStore.open_group() got an unexpected keyword argument 'align_chunks'

nice! it caught it

[dcherian]

this can't be right; it's been running so far!

[ianhi]

this was a bit confusing. but i saw very consistent failures on the min version tests

[ianhi]

agree that this seems wrong though

[dcherian]

do we just need to skip when dtype.kind == "S"? If so we can use hypothesis.strategies.assume in the body of the test. It'd be nice to be much narrower here

[ianhi]

will look into it

[dcherian]

let's have this be the latest released versions. Otherwise our PRs will start failing when there's some Xarray/Zarr incompatibility on their main branches. we already run nightly upstream tests.

[ianhi]

good call. Although the nightly tests don't actually test the backends :(

Also I'm somewhat shocked that this never failed in the past. it's always been checking out the latest git version, not the most recent release.

I'll look into grabbing the xarray verssion and using that to checkout, but it may get a bit complicated.

[ianhi]

ok this is ready now!

The pending tests:

are that way because the github settings require those tests, but we no longer have tests by those names (because of teh version info in the test name) so I can update that post merge

[dcherian]

@jhamman or @paraseba you'll need to change the "required" check list for us to merge this

[ianhi]

@jhamman or @paraseba you'll need to change the "required" check list for us to merge this

I have this power :) I will update those required checks now