Solr 9.4 → 9.5 for integration tests

[thomascorthals]

Four changes to the tests:

• Workaround for SOLR-17176 that causes test failures against Solr 9.5
• Updated test for SOLR-6853 workaround to test a fix introduced in Solr 9.4.1
• Added @group proxy to tests that require a running proxy so you can easily exclude them when testing locally
• Moved a test that doesn't require a running Solr instance out of AbstractTechproductsTestCase

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.74%. Comparing base (ae4ea59) to head (9c6d042).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1121   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files         400      400           
  Lines       10520    10520           
=======================================
  Hits        10283    10283           
  Misses        237      237           

Flag	Coverage Δ
unittests	97.74% <ø> (ø)

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