Allow Security Hotspots to be filtered by OWASP Top 10 2021

With the introduction of OWASP Top 10 2021 support, the Security Reports (EE+) can link to the Security Hotspots page directly, filtering by a specific standard. We need to add support for OWASP Top 10 2021 to api/hotspots/search (internal).

Introduce a new parameter, owaspTop10-2021. This optional parameter can take a list of rules, separated by a comma (ex: "a1,a2,a6"). See the existing owaspTop10 parameter.