wrong choice of axes in hkl scan for i06-1

[DanPorter]

Scan file:
/dls/i06-1/data/2025/mm39834-1/i06-1-366107.nxs
@axes:
/entry/ca62sr/hkl_k
@signal:
/entry/ca62sr/ca62sr

import hdfmap
f = '/dls/i06-1/data/2025/mm39834-1/i06-1-366107.nxs'
m = hdfmap.create_nexus_map(f)

with m.load_hdf() as h:
    data = m.get_plot_data(h)
    print(f"Plot axes: {data['axes_names']}") # -> ['h']

WARNING:hdfmap.hdfmap_class:name: 'hkl_k' not in scannables

[DanPorter]

Traced the problem to HdfMap.first_last_scannables:
https://github.com/DiamondLightSource/hdfmap/blob/4a6936217f523796494419d79875e733bc11f533/src/hdfmap/hdfmap_class.py#L540C13-L561C27

The problem is that self.scannables does not contain the name hkl_k but instead contains k which links to the origin of the linked dataset:

self.scannables = {
 'h': '/entry/instrument/hkl.h/value',
 'k': '/entry/instrument/hkl.k/value',
 'l': '/entry/instrument/hkl.l/value',
 'ca62sr': '/entry/instrument/ca62sr/value',
 'ca64sr': '/entry/instrument/ca64sr/value',
 'ddth': '/entry/instrument/ddth/value',
 'dd2th': '/entry/instrument/dd2th/value'
}

The solution might be to look for alternative names in the scannables. For instance:

self.datasets['/entry/ca62sr/hkl_k'].names -> ['k', 'hkl_k', 'ca62sr_hkl_k', 'NXdata_hkl_k']

[DanPorter]

Changed HdfMap.first_last_scannables to look for alternative names. Added tests to edge cases and these pass.
Fix will be rolled out in next release.