split msi signing from creation to reduce number of singtool calls

as with private key on crypto-smartcard you'd have to enter your pin
over a hundred times while creating full-lang builds and that is not
fun.
This reduces it to
* once for dll/exe
(at least in case for mergelib is is less than 350 objects and
that doesn't break commandline limits - previously it was set to
only sign 20 objects at a time, forcing a pin-entry over 15 times) and
* once for main installation set
* once for SDK
* once for all the helppacks
(signing description previously also contained the language, this
change drops that to just "<productname> <version> Helppack"

and last three are not scattered timewise, but are done after all
packaging is complete, so the build only waits twice for user-input.

Change-Id: Ibb8bb233e967556f9654573ad30d0ed5883b533f
Reviewed-on: https://gerrit.libreoffice.org/78649
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>

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