tests: Delete RHEL specific packages

Resolves: RHEL-66126 gdm dependencies are updated for the headless session

tests/ibus-desktop-testing/install3-rhel/main.fmf

@@ -1,13 +1,7 @@
 summary: Install RHEL specific GNOME desktop components
 description:
-    gdm-headless-login-session is not available in RHEL 10 GDM yet and
-    the listed packages are required by the command.
+    Currently no specific packages for RHEL.
 enabled: false
 adjust:
     when: distro != fedora
     enabled: true
-require:
-    - accountsservice
-    - accountsservice-libs
-    - pam
-    - python3-pam

tests/ibus-desktop-testing/install5-tmt/main.fmf

@@ -3,4 +3,3 @@ description:
     The test script is calling the beakerlib script.
 require:
     - beakerlib
-    #- tmt

tests/ibus-desktop-testing/run/test.sh

@@ -4,11 +4,6 @@
 
 rlJournalStart
     rlPhaseStartTest
-        rlRun -t "mkdir -p /usr/lib/systemd/system"
-        rlRun -t "cp ../tmp/gnome-headless-session@.service /usr/lib/systemd/system/."
-        rlRun -t "cp ../tmp/gdm-headless-login-session /usr/libexec/."
-        rlRun -t "chmod 755 /usr/libexec/gdm-headless-login-session"
-        rlRun -t "cp -R ../tmp/no-overview@fthx ."
         rlRun -t "/usr/bin/ibus-desktop-testing-runner --runner gnome --no-graphics --lang ja_JP.UTF-8"
     rlPhaseEnd
     rlPhaseStartCleanup