Remove periodic state dump support

The existing periodic state dump support has numerous problems (see YUNIKORN-1483 for details). Given the challenges in fixing it and the the lack of use in the community, we should instead remove it. We can leave the configuration support in place for the next release with a deprecation warning.

Release notes also need updating to reflect that the /ws/v1/periodicstatedump REST API endpoint is deprecated as well as the statedumpfilepath partition configuration option. These still exist, but are non-functional and will be removed in a future release.