Fixes `RequestUtil` failure verification: assertion error not propagated.

[tomaszmichalak]

Description

When checking RX failure conditions, errors from assertions are not propagated. Tests give a false positive results.

Motivation and Context

This tool is used in may repositories.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have read the CONTRIBUTING document.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

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[codecov[bot]]

Codecov Report

Merging #62 into master will increase coverage by 2.46%. The diff coverage is 97.40%.

@@             Coverage Diff              @@
##             master      #62      +/-   ##
============================================
+ Coverage     84.36%   86.82%   +2.46%     
- Complexity      241      261      +20     
============================================
  Files            27       28       +1     
  Lines           921      987      +66     
  Branches         65       65              
============================================
+ Hits            777      857      +80     
+ Misses          106       92      -14     
  Partials         38       38              

Impacted Files	Coverage Δ	Complexity Δ
...est/java/io/knotx/junit5/util/RequestUtilTest.java	97.14% <97.14%> (ø)	16.00 <16.00> (?)
...rc/main/java/io/knotx/junit5/util/RequestUtil.java	100.00% <100.00%> (+100.00%)	4.00 <2.00> (+4.00)

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