Add random seed setting

[YamLyubov]

WIP

[pep8speaks]

Hello @YamLyubov! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file test/integration/test_reproducability.py:

Line 35:5: F841 local variable 'old_found_graphs' is assigned to but never used

[aim-pep8-bot]

Hello @YamLyubov! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file test/integration/test_reproducability.py:

Line 35:5: F841 local variable 'old_found_graphs' is assigned to but never used

[codecov-commenter]

Codecov Report

Merging #203 (50e20c4) into main (3234a52) will increase coverage by 0.10%. Report is 4 commits behind head on main. The diff coverage is 70.68%.

@@            Coverage Diff             @@
##             main     #203      +/-   ##
==========================================
+ Coverage   74.13%   74.24%   +0.10%     
==========================================
  Files         129      130       +1     
  Lines        7687     7768      +81     
==========================================
+ Hits         5699     5767      +68     
- Misses       1988     2001      +13     

Files	Coverage Δ
golem/core/dag/graph.py	77.01% <ø> (ø)
...adaptive/mab_agents/neural_contextual_mab_agent.py	77.77% <100.00%> (ø)
golem/core/optimisers/adaptive/neural_mab.py	17.15% <ø> (ø)
golem/core/optimisers/adaptive/operator_agent.py	92.17% <100.00%> (+0.99%)	:arrow_up:
golem/core/optimisers/genetic/gp_params.py	100.00% <100.00%> (ø)
golem/core/optimisers/optimization_parameters.py	97.14% <100.00%> (+0.08%)	:arrow_up:
golem/visualisation/graph_viz.py	63.15% <100.00%> (+0.12%)	:arrow_up:
...ore/optimisers/genetic/operators/base_mutations.py	90.81% <85.71%> (-0.56%)	:arrow_down:
...olem/core/optimisers/genetic/operators/mutation.py	89.21% <50.00%> (ø)
golem/visualisation/opt_history/fitness_line.py	35.15% <0.00%> (ø)
... and 4 more

... and 2 files with indirect coverage changes