Update E2E 10-branching_actions tests

[unsortedhashsets]

This PR updates tests scenarios for branching actions and nested branching actions from through canvas to through choice extension

• Check that tab/button is disabled
• Сhoice-extension workaround is used where it is possible (delete/append/prepend/step_actions)
• In general 10-branching_actions tests were refactored

Relates:

• Issues-1297
• Issues-1473
• Issues-1381

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
3.2% Duplication

[kahboom]

thank you @unsortedhashsets !

[codecov]

Codecov Report

Merging #1516 (16d48f9) into main (b1c6b90) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1516   +/-   ##
=======================================
  Coverage   56.46%   56.46%           
=======================================
  Files          64       64           
  Lines        2019     2019           
  Branches      464      464           
=======================================
  Hits         1140     1140           
  Misses        833      833           
  Partials       46       46           

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