Restructure solenv/bin/assemble-flatpak.sh

...so that parts of it can be reused by the Flatpak build done from Fedora RPMs
(see <https://src.fedoraproject.org/flatpaks/libreoffice>).  The reused parts
are split out into solenv/bin/assemble-flatpak-*.sh files.

(I can't remember any specific reason why I added the <releases> section to the
Flathub org.libreoffice.LibreOffice.appdata.xml; maybe just because the file
format allows for it and it appeared easy to generate the section when writing
the file.  For the Fedora LO RPMs, none of the existing appdata.xml files
contained such a section, and generating one for the Fedora Flatpak case would
require obtaining values for those LIBO_VERSION_* variables, so I just added a
switch to solenv/bin/assemble-flatpak-appdata-step1.sh allowing not to write
that section at all.  Splitting solenv/bin/assemble-flatpak-appdata.sh in two
steps is necessary because the Fedora Flatpak case wants to replace the
screenshots in the first part of the generated
org.libreoffice.LibreOffice.appdata.xml, but not in the appended original
appdata.xml files, so needs to hook in between those two steps.)

Change-Id: Ic527f3d88ccbee85e86dad3569b8e73776adf273
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/93260
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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