Remove obfs3 tests

With #31055 we don't have default obfs3 bridges anymore.

TBBTestSuite/TestSuite/BrowserBundleTests.pm

@@ -218,21 +218,6 @@ our @tests = (
         enable          => sub { $OSNAME eq 'linux' && $options->{PTtests} },
         run_once        => 1,
     },
-    {
-        name            => 'tor_obfs3',
-        type            => 'tor_bootstrap',
-        descr           => 'Access tor using obfs3',
-        enable          => sub { $OSNAME eq 'linux' && $options->{PTtests} },
-        run_once        => 1,
-    },
-    {
-        name            => 'tor_obfs3_httpproxy',
-        type            => 'tor_bootstrap',
-        descr           => 'Access tor using obfs3 and an http proxy',
-        httpproxy       => 1,
-        enable          => sub { $OSNAME eq 'linux' && $options->{PTtests} },
-        run_once        => 1,
-    },
     {
         name            => 'tor_obfs4',
         type            => 'tor_bootstrap',

tor-config/tor_obfs3.conf

-[% INCLUDE main_config %]
-[% IF tbbinfos.os == 'Windows';
-        SET bin_ext = 'exe';
-   ELSE;
-        SET bin_ext = 'bin';
-   END;
--%]
-
-UseBridges 1
-Bridge obfs3 83.212.101.3:80 A09D536DD1752D542E1FBB3C9CE4449D51298239
-Bridge obfs3 169.229.59.74:31493 AF9F66B7B04F8FF6F32D455F05135250A16543C9
-Bridge obfs3 169.229.59.75:46328 AF9F66B7B04F8FF6F32D455F05135250A16543C9
-Bridge obfs3 109.105.109.163:38980 1E05F577A0EC0213F971D81BF4D86A9E4E8229ED
-Bridge obfs3 109.105.109.163:47779 4C331FA9B3D1D6D8FB0D8FBBF0C259C360D97E6A
-ClientTransportPlugin obfs3 exec [% tbbinfos.ptdir %]/obfsproxy.[% bin_ext %] managed

tor-config/tor_obfs3_httpproxy.conf

-[% INCLUDE tor_obfs3.conf %]
-[% INCLUDE http_proxy %]