tests: Remove SSAValue construction from tests

[webmiche]

This PR relpaces all SSAValue constructors with OpResult since SSAValue is an abstract base class, therefore it should not be instantiated ever.

closes #284

[tobiasgrosser]

I would like to review this carefully. 😉

[math-fehr]

Nice!

[codecov]

Codecov Report

Base: 90.18% // Head: 90.18% // No change to project coverage 👍

Coverage data is based on head (a3b6ff6) compared to base (63ef315).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #324   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files          52       52           
  Lines        7149     7149           
  Branches     1176     1176           
=======================================
  Hits         6447     6447           
  Misses        460      460           
  Partials      242      242           

Impacted Files	Coverage Δ
tests/dialects/test_memref.py	100.00% <100.00%> (ø)
tests/test_ssavalue.py	100.00% <100.00%> (ø)

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