Make MockHttpServletRequest.getRequestDispatcher to consider context path

[volodymyr-korzh]

Changes required for HtmlUnitMockHttpServletRequest to consider context path for org.springframework.mock.web.MockHttpServletRequest#getRequestDispatcher method.

As org.springframework.mock.web.MockHttpServletRequest#getRequestDispatcher has no consideration of context path, but jetty ServletContextApi is actually considering context path for getRequestDispatcher method, it is required to align mock behaviour for tests.

See:

• org.eclipse.jetty.ee10.servlet.ServletContextHandler.ServletContextApi#getRequestDispatcher
• org.springframework.mock.web.MockHttpServletRequest#getRequestDispatcher

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.59%. Comparing base (406db33) to head (abb50a5).
Report is 38 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6292      +/-   ##
============================================
+ Coverage     83.54%   83.59%   +0.05%     
- Complexity    27432    27563     +131     
============================================
  Files          1707     1715       +8     
  Lines        106185   106674     +489     
  Branches      13397    13434      +37     
============================================
+ Hits          88710    89173     +463     
+ Misses        11750    11741       -9     
- Partials       5725     5760      +35     

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