[onecollector] Prevent event full name mappings with "namespace.*" form

[CodeBlanch]

Relates to #2021

Changes

• Harden the validation introduced on [OneCollector] Introduce EventFullNameMappings on options #2021 to prevent mappings with a trailing wildcard.

  • Before
    • Invalid: { ["Prefix"] = "*.Name" }, { ["Prefix"] = "*.*" }
    • Valid: { ["Prefix"] = "*" }, { ["Prefix"] = "Namespace.*" } (unintentional)
  • After
    • Invalid: { ["Prefix"] = "*.Name" }, { ["Prefix"] = "*.*" }, { ["Prefix"] = "Namespace.*" }
    • Valid: { ["Prefix"] = "*" }

• Add additional tests to cover more possible user inputs and capture supported use cases.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.32%. Comparing base (71655ce) to head (3e9ef31).
Report is 411 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2043       +/-   ##
===========================================
+ Coverage   73.91%   94.32%   +20.40%     
===========================================
  Files         267       28      -239     
  Lines        9615     1180     -8435     
===========================================
- Hits         7107     1113     -5994     
+ Misses       2508       67     -2441     

Flag	Coverage Δ
unittests-Exporter.OneCollector	94.32% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ry.Exporter.OneCollector/Internal/EventFullName.cs	100.00% <100.00%> (ø)

... and 268 files with indirect coverage changes