Add flag to get_nwb_version to include prerelease info

[rly]

Fix issue raised in https://github.com/NeurodataWithoutBorders/pynwb/pull/1611/files#r1050227285

Merging into schema_2.6.0 branch #1611.

[codecov]

Codecov Report

Merging #1639 (61c6382) into schema_2.6.0 (bbc5e0e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           schema_2.6.0    #1639      +/-   ##
================================================
+ Coverage         91.84%   91.86%   +0.01%     
================================================
  Files                26       26              
  Lines              2576     2580       +4     
  Branches            493      494       +1     
================================================
+ Hits               2366     2370       +4     
  Misses              134      134              
  Partials             76       76              

Flag	Coverage Δ
integration	71.43% <100.00%> (+0.04%)	⬆️
unit	83.68% <14.28%> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
src/pynwb/io/utils.py	100.00% <100.00%> (ø)

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