Revert "tests/avocado: Enable reverse_debugging.py tests in gitlab CI"

This reverts commit c4d74ab24a.

The reverse debugging test is sometimes still failing. See:
 https://gitlab.com/qemu-project/qemu/-/issues/1992

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20231121100842.677363-1-thuth@redhat.com>

tests/avocado/reverse_debugging.py

@@ -205,6 +205,8 @@ class ReverseDebugging_X86_64(ReverseDebugging):
         return self.get_reg_le(g, self.REG_PC) \
             + self.get_reg_le(g, self.REG_CS) * 0x10
 
+    # unidentified gitlab timeout problem
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_x86_64_pc(self):
         """
         :avocado: tags=arch:x86_64
@@ -220,6 +222,8 @@ class ReverseDebugging_AArch64(ReverseDebugging):
 
     REG_PC = 32
 
+    # unidentified gitlab timeout problem
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_aarch64_virt(self):
         """
         :avocado: tags=arch:aarch64
@@ -242,6 +246,8 @@ class ReverseDebugging_ppc64(ReverseDebugging):
 
     REG_PC = 0x40
 
+    # unidentified gitlab timeout problem
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_ppc64_pseries(self):
         """
         :avocado: tags=arch:ppc64
@@ -253,6 +259,8 @@ class ReverseDebugging_ppc64(ReverseDebugging):
         self.endian_is_le = False
         self.reverse_debugging()
 
+    # See https://gitlab.com/qemu-project/qemu/-/issues/1992
+    @skipIf(os.getenv('GITLAB_CI'), 'Running on GitLab')
     def test_ppc64_powernv(self):
         """
         :avocado: tags=arch:ppc64