Add missing plugins.algorithms to imports in SX peak integration algorithms

[RichardWaiteSTFC]

Description of work

Add missing plugins.algorithms to imports in SX peak integration algorithms - causing errors such as this on opening nightly
on IDAaaS

Python-[Warning] Failed to load plugin /mnt/ceph/home/rw1061637/.conda/envs/mantid-unstable/plugins/python/algorithms/FindSXPeaksConvolve.py.Error: Traceback (most recent call last):  File "/home/rw1061637/.conda/envs/mantid-unstable/lib/python3.10/site-packages/mantid/kernel/plugins.py", line 187, in load_from_file    name, module = load_plugin(filepath)  File "/home/rw1061637/.conda/envs/mantid-unstable/lib/python3.10/site-packages/mantid/kernel/plugins.py", line 208, in load_plugin    module = loader.run()  File "/home/rw1061637/.conda/envs/mantid-unstable/lib/python3.10/site-packages/mantid/kernel/plugins.py", line 47, in run    return SourceFileLoader(name, pathname).load_module()  File "<frozen importlib._bootstrap_external>", line 548, in _check_name_wrapper  File "<frozen importlib._bootstrap_external>", line 1063, in load_module  File "<frozen importlib._bootstrap_external>", line 888, in load_module  File "<frozen importlib._bootstrap>", line 290, in _load_module_shim  File "<frozen importlib._bootstrap>", line 719, in _load  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked  File "<frozen importlib._bootstrap_external>", line 883, in exec_module  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed 
File "/mnt/ceph/home/rw1061637/.conda/envs/mantid-unstable/plugins/python/algorithms/FindSXPeaksConvolve.py", line 27, in <module>    from IntegratePeaksSkew import InstrumentArrayConverter, get_fwhm_from_back_to_back_paramsImportError: cannot import name 'get_fwhm_from_back_to_back_params' from 'IntegratePeaksSkew'

Ultimately I plan to refactor this to remove such imports by putting the common code in a separate file as part of #36989

There is no associated issue.

To test:

(1) CI passes
(2) Run this script without error

Load(Filename='/mnt/ceph/home/rw1061637/TrainingCourseData/SXD23767.raw', OutputWorkspace='SXD23767')
FindSXPeaksConvolve(InputWorkspace='SXD23767', PeaksWorkspace='peaks', GetNBinsFromBackToBackParams=True, NFWHM=6)
IntegratePeaks1DProfile(InputWorkspace='SXD23767', PeaksWorkspace='peaks', OutputWorkspace='peaks_int_profile', GetNBinsFromBackToBackParams=True, NFWHM=6, CostFunction='RSq', FixPeakParameters='A')
IntegratePeaksShoeboxTOF(InputWorkspace='SXD23767', PeaksWorkspace='peaks', OutputWorkspace='peaks_int_shoe', GetNBinsFromBackToBackParams=True, NFWHM=6, WeakPeakStrategy='NearestStrongPeak')

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[jclarkeSTFC]

Script ran fine on an Ubuntu build, no errors, I used the version of the SXD run from the archive instead of the training data, but I don't think that makes any difference.

There were a couple of warnings about invalid values in sqrt and divide, but that's unrelated to this PR.