[tor-bugs] #34022 [Applications/Tor Browser]: Rename the testbuild/torbrowser-testbuild targets

[Tor Bug Tracker & Wiki]

#34022: Rename the testbuild/torbrowser-testbuild targets
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     Reporter:  boklm                     |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
                                          |  TorBrowserTeam202004
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 For release, alpha and nightly we use the same target name in
 `projects/release/config` and other components.

 For testbuild however, we use the `testbuild` target in
 `projects/release/config`, which is using the `torbrowser-testbuild`
 target (defined in rbm.conf) for building other components, which can be
 confusing. There is also a `testbuild` target in rbm.conf, which is used
 by `torbrowser-testbuild`.

 I think we could fix that by renaming the `torbrowser-testbuild` target we
 have in `rbm.conf` to `testbuild`, and the current `testbuild` target to
 `testbuild-common`.

 This will however require that people who use a custom `rbm.local.conf`
 update it.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34022>
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