added grow option to multiselect

[saberlynx]

Checklist:

And updated snapshots.

• [] Tests
• CHANGELOG Entry

[codecov]

Codecov Report

Merging #1485 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1485      +/-   ##
==========================================
- Coverage      37%   36.97%   -0.04%     
==========================================
  Files         996      996              
  Lines       22254    22277      +23     
  Branches     6111     6137      +26     
==========================================
+ Hits         8235     8236       +1     
- Misses      12705    12726      +21     
- Partials     1314     1315       +1

Impacted Files	Coverage Δ
gsa/src/web/components/form/multiselect.js	95.83% <ø> (ø)	⬆️
gsa/src/web/pages/tickets/createdialog.js	100% <ø> (ø)	⬆️
gsa/src/web/components/form/selectelements.js	92.2% <100%> (+0.1%)	⬆️
gsa/src/web/components/folding/folding.js	10.18% <0%> (-2.61%)	⬇️

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