Fix uniqueness of hdf5-based dask arrays

[mraspaud]

This PR makes sure that the same hdf5 dataset read from the same file yields the same dask array (name).

• Closes Composite snow_age fails (no 'area') after composite cloud_phase #2724
• Tests added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.94%. Comparing base (3c7938c) to head (2c6af5e).
Report is 33 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2818   +/-   ##
=======================================
  Coverage   95.94%   95.94%           
=======================================
  Files         366      366           
  Lines       53504    53518   +14     
=======================================
+ Hits        51332    51346   +14     
  Misses       2172     2172           

Flag	Coverage Δ
behaviourtests	4.04% <0.00%> (-0.01%)	⬇️
unittests	96.03% <100.00%> (+<0.01%)	⬆️

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[coveralls]

Pull Request Test Coverage Report for Build 9499281255

Details

• 13 of 13 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 96.041%

---

Totals
Change from base Build 9497248893:	0.001%
Covered Lines:	51573
Relevant Lines:	53699

---

💛 - Coveralls

[djhoese]

Windows environment was failing for seemingly unrelated reasons. Restarted...

[coveralls]

Pull Request Test Coverage Report for Build 9579385362

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 17 of 17 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 96.041%

---

Totals
Change from base Build 9497248893:	0.001%
Covered Lines:	51575
Relevant Lines:	53701

---

💛 - Coveralls

[djhoese]

From what I can tell this looks good to me. Feel free to merge.