[bcl] Remove the ValueAdd and InetAccess NUnit categories (#2212)

[bcl] Remove the ValueAdd and InetAccess NUnit categories (#2212)

ValueAdd was added over a decade ago and all the tests marked with this category are passing now.

We have *tons* of tests that rely on working DNS/Internet that aren't marked with
InetAccess (and they actually provide good value so we don't want to exclude them).

Since these categories don't really make sense and just causes confusion
it's better to just remove them.