historydb: Prevent insertion of duplicate group packages

[m-blaha]

When a package is included in a comps group multiple times, dnf5
attempts to insert that package multiple times into the
comps_group_package table of the transaction history database. However,
the table enforces a unique constraint on the (group_id, name_id) tuple.
This results in terminating dnf5 process.

This patch modifies the CompsGroupPackageDbUtils::comps_group_packages_insert()
method to track which packages have already been inserted and skip
duplicates.

Here is an example of such group with duplicated packages from rpmfusion
repository (see the libavcodec-freeworld package):

<group>
  <id>multimedia</id>
  <name>Multimedia</name>
  <description>Audio/video framework common to desktops</description>
  <default>false</default>
  <uservisible>false</uservisible>
  <packagelist>
    <packagereq>gstreamer1-plugins-bad-freeworld</packagereq>
    <packagereq>gstreamer1-plugins-ugly</packagereq>
    <packagereq type="conditional" requires="chromium">libavcodec-freeworld</packagereq>
    <packagereq type="conditional" requires="firefox">libavcodec-freeworld</packagereq>
    <packagereq type="conditional" requires="libavcodec-free">libavcodec-freeworld</packagereq>
    <packagereq type="conditional" requires="libheif">libheif-freeworld</packagereq>
    <packagereq type="conditional" requires="pipewire">pipewire-codec-aptx</packagereq>
    <packagereq type="conditional" requires="qt5-qtwebengine">qt5-qtwebengine-freeworld</packagereq>
    <packagereq type="conditional" requires="vlc-libs">vlc-plugins-freeworld</packagereq>
  </packagelist>
</group>

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2263762
Test: rpm-software-management/ci-dnf-stack#1580

[ppisar]

I confirm it fixes the SQL constraint violation and the it fixes installing multimedia group of rpmfusion-free repository.