Changing RQAOA tests to specific instances

[kidiki]

The test for vanishing instances, test_total_elimination_whole_workflow(self), was too large and failed. Now testing only for the specific function, solution_for_vanishing_instances().

Description

• Removed test_total_elimination_whole_workflow(self)
• Wrote test_solution_for_vanishing_instances(self) to create a minimal example to test the functionality of this specific function.

[codecov[bot]]

Codecov Report

Merging #169 (48c7d99) into dev (6718f37) will decrease coverage by 0.05%. The diff coverage is 86.74%.

@@            Coverage Diff             @@
##              dev     #169      +/-   ##
==========================================
- Coverage   81.60%   81.55%   -0.05%     
==========================================
  Files         103      104       +1     
  Lines       12128    12379     +251     
==========================================
+ Hits         9897    10096     +199     
- Misses       2231     2283      +52     

Impacted Files	Coverage Δ
openqaoa/backends/qpus/qaoa_qiskit_qpu.py	19.35% <33.33%> (-0.22%)	:arrow_down:
tests/test_backends.py	45.33% <45.33%> (ø)
openqaoa/backends/qpus/qaoa_braket_qpu.py	20.87% <50.00%> (-0.24%)	:arrow_down:
openqaoa/optimizers/optimization_methods.py	86.95% <88.50%> (+0.84%)	:arrow_up:
openqaoa/derivative_functions.py	94.08% <92.12%> (-3.86%)	:arrow_down:
openqaoa/optimizers/result.py	94.07% <95.00%> (+0.32%)	:arrow_up:
openqaoa/backends/qpus/qaoa_pyquil_qpu.py	93.10% <100.00%> (+0.08%)	:arrow_up:
openqaoa/backends/simulators/qaoa_qiskit_sim.py	100.00% <100.00%> (ø)
openqaoa/basebackend.py	93.05% <100.00%> (+6.25%)	:arrow_up:
...mizers/pennylane/optimization_methods_pennylane.py	90.69% <100.00%> (ø)
... and 10 more

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