Constellation was a NS1 thing and isn't related to NS2. I'm not sure but you can probably still donate to get Constellation, but as said I'm pretty sure it was stated before that it won't show in NS2, if that's what you want.
The playtesting icon is for those who playtested NS1 pre-release and during the version updates over the years. Some of us have returned to do some smaller playtesting of NS2 to iron out major things before public releases, but unfortunately no, no one else will be added to this group unless you're invited by the devs to partake in small group tests before public builds that will be released during the weeks of the alpha.
If you purchased the $40 version you'll have the all black armor whenever you play online. The version with the black armor becomes unavailable for purchase after tomorrow. So as long as you have it you'll be in the cool club. It's kinda similar to the constellation icons people had since it's exclusive.
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Constellation was a NS1 thing and isn't related to NS2. I'm not sure but you can probably still donate to get Constellation, but as said I'm pretty sure it was stated before that it won't show in NS2, if that's what you want.