fix(replay): Don't mangle private _cssText rrweb property
#7033
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Our mangler strikes again! This time in
rrwebwhereattributes._cssTextis accessed (example). This PR adds this property to the list of reserved properties excluded from mangling.Note: I went through the rrweb source code and didn't find other private properties, leading me to believe that for now we should be good in terms of bundling. rrweb accesses a bunch of double
__variables (e.g.__snhere) but these are not touched by terser and hence fine (+ I double checked that they actually end up in our bundles).h/t @billyvg for raising this issue