We were using UTM params on various branding urls which weren't
compliant to standard utm params and hence were ignored by analytics
tooling. this PR ensures that the params stays compliant with defined
standard
ref: https://en.wikipedia.org/wiki/UTM_parameters
## Changes
- updated utm tags on widget and survey urls
- added utm on helpcenter branding
---------
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
9145658597