Display warning if user has COI/paid templates on their userpage/user talk

[NovemLinguae]

Suggested by KylieTastic at https://en.wikipedia.org/wiki/Wikipedia_talk:WikiProject_Articles_for_creation#Paid_contributions

Could detect templates rather than text, which would have no false positives.

Ideas of things to detect

• User page
  • {{Connected contributor}}
  • {{Connected contributor (paid)}}
  • {{UserboxCOI}}
• User talk page
  • same as above, but also...
  • {{uw-coi}} - usually subst'd, so detect some of its text
  • {{uw-coi-username}} - usually subst'd, so detect some of its text

Could notify in the spot where we notify for things like previous CSDs. Screenshot example: