Several refactoring items

[marcosbento]

Description

Several refactoring items

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

🌦️ >> Documentation << 🌦️
https://sites.ecmwf.int/docs/dev-section/ecflow/pull-requests/PR-308

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.68966% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.63%. Comparing base (cb5f79b) to head (3d813a1).

Files with missing lines	Patch %	Lines
libs/test/overall/harness/TestFixture.cpp	0.00%	6 Missing ⚠️
libs/client/test/harness/SCPort.cpp	40.00%	3 Missing ⚠️
libs/base/src/ecflow/base/Gnuplot.cpp	0.00%	2 Missing ⚠️
libs/client/test/TestPlugCmd.cpp	0.00%	2 Missing ⚠️
libs/core/src/ecflow/core/LogVerification.cpp	0.00%	2 Missing ⚠️
libs/core/test/TestStr.cpp	0.00%	2 Missing ⚠️
libs/node/src/ecflow/node/ExprAst.cpp	0.00%	2 Missing ⚠️
libs/node/src/ecflow/node/InLimitMgr.cpp	33.33%	2 Missing ⚠️
libs/node/src/ecflow/node/Node.cpp	77.77%	2 Missing ⚠️
libs/test/overall/TestTrigger.cpp	0.00%	2 Missing ⚠️
... and 3 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #308      +/-   ##
===========================================
- Coverage    49.68%   49.63%   -0.05%     
===========================================
  Files         1237     1237              
  Lines        97636    97536     -100     
  Branches     14829    14828       -1     
===========================================
- Hits         48507    48412      -95     
+ Misses       49129    49124       -5     

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