Include PSD.xml.gz in the initial coinc.xml upload
We should include the PSD.xml.gz files in the intiial coinc.xml upload rather than pushing data twice to GraceDB.
This change has been suggested from discussions from emfollow meetings, recommended in the interface definition specified here: https://lscsoft.docs.ligo.org/ligo.skymap/interface.html, and is currently done by all other CBC search pipelines.
Originally, the PSD.xml.gz was uploaded separately to minimise the wait time before the initial alert upload from SPIIR. However, if the additional time required to incorporate and upload the PSD.xml.gz is trivial, it is strongly recommended to include it in the initial upload.