Fix invalid duplicate indices using ArchivableBehavior for some platforms

[felixgeyer]

Resolves #1894

Please let me know, if we can write tests for this behavior depending on different platforms. Without the fix, test setup will fail because of the error described in the linked issue.

To keep it more simple, we could also discuss to never copy the original's index name which might be a breaking change if someone relies on the archive index name.

[codecov-commenter]

Codecov Report

Merging #1904 (af565f1) into master (966046e) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1904   +/-   ##
=========================================
  Coverage     87.64%   87.64%           
- Complexity     7825     7828    +3     
=========================================
  Files           227      227           
  Lines         21177    21182    +5     
=========================================
+ Hits          18560    18565    +5     
  Misses         2617     2617           

Flag	Coverage Δ
5-max	87.64% <100.00%> (+<0.01%)	:arrow_up:
7.4	87.64% <100.00%> (+<0.01%)	:arrow_up:
agnostic	67.03% <100.00%> (+<0.01%)	:arrow_up:
mysql	68.82% <0.00%> (-0.04%)	:arrow_down:
pgsql	68.84% <0.00%> (-0.04%)	:arrow_down:
sqlite	66.66% <0.00%> (-0.04%)	:arrow_down:

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

Impacted Files	Coverage Δ
...nerator/Behavior/Archivable/ArchivableBehavior.php	91.95% <100.00%> (+0.49%)	:arrow_up:

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