Add a util function to cover Profile::IsOffTheRecord, Tor profiles, and guest sessions

[tmancey]

We have Tor regular and Tor incognito profiles created when using Tor window, the regular one will return false for Profile::IsOffTheRecord. Some of our services currently only checks Profile::IsOffTheRecord where it will miss Tor regular profile, and guest profile's parent profile (they also seem to create a pair as we do for Tor).
This issue is to add a brave's own IsRegularProfile to exclude otr, Tor profiles, and guest sessions.

[tmancey]

@fmarier FYI

[yrliou]

When creating Tor window, we have a pair of profile being created, one regular dummy profile and one incognito one which is used for actual browsing. It is expected that one would return true for Profile::IsOffTheRecord and the other one would return false for Profile::IsOffTheRecord.
Plan here is to add brave::IsRegularProfile for our own services to use which will return !brave::IsTorProfile && profile::IsRegularProfile.