cubicweb #3955372 deprecate baseuri() [validation pending]

We've had BASE_URL since 3.11.2 released 3+ years ago.

prioritynormal
typebug
done in3.20.0
load0.500
load left0.000
closed by#95902c0b991b [web/js] Deprecate baseuri() and replace with BASE_URL (closes #3955372)
patch[web] Deprecate baseuri() and replace with BASE_URL (closes #3955372) [applied]