Fix AnyValue test failures with old Boost versions

[speth]

Without Boost, the string versions of certain typenames are compiler-dependent.

Changes proposed in this pull request

• Make sure we use consistent names for all of the types where we end up checking for the names in the test suite.
• correct comment indicating the minimum version of Boost that has the demangle function.

If applicable, fill in the issue number this pull request is fixing

Fixes #1040

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review

[codecov]

Codecov Report

Merging #1123 (5559070) into main (a84b6e6) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1123      +/-   ##
==========================================
- Coverage   73.45%   73.45%   -0.01%     
==========================================
  Files         364      364              
  Lines       47884    47884              
==========================================
- Hits        35172    35171       -1     
- Misses      12712    12713       +1     

Impacted Files	Coverage Δ
src/base/AnyMap.cpp	89.51% <ø> (-0.11%)	⬇️

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[ischoegl]

Looks good to me (per rationale in commit comment).