[backport] Merge branch 'issue/mdarray-to-mdspan' into 'master'

Simon Praetoriusrequested to merge
cherry-pick-a7da5ef8 into releases/2.10

Fix mdspan converting constructor

See merge request !1522 (merged)

(cherry picked from commit a7da5ef8)

2c0dda20 Fix mdspan converting constructor 7c72f546 Add test for the converting constructor

Co-authored-by: Christoph Grüninger gruenich@dune-project.org

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