Refactoring name validity

[marcosbento]

Description

Refactoring name validity, This improves runtime performance and also clarifies the error message.

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-310

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.93617% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 49.63%. Comparing base (b8b9e22) to head (af41988).

Files with missing lines	Patch %	Lines
libs/node/src/ecflow/node/AvisoAttr.cpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #310   +/-   ##
========================================
  Coverage    49.62%   49.63%           
========================================
  Files         1237     1238    +1     
  Lines        97536    97542    +6     
  Branches     14828    14833    +5     
========================================
+ Hits         48407    48414    +7     
+ Misses       49129    49128    -1     

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