re-evaluate paging loading speed after ckan 2.11 release in catalog-next

[FuhuXia]

With recent view count turned on, catalog dataset listing page loading speed is slow, average 6+ seconds, 8.25 seconds as shown in the screen shot. There are multiple factors playing a role to affect the speed, as noticed in research done for https://github.com/GSA/data.gov/issues/4708.

• DB latency
• DB index
• set ckanext.datagovcatalog.add_packages_tracking_info = true in ckanext-datagovcatalog.
• set ckanext.datagovtheme.js_recent_view = true in ckanext-datagovdatagovtheme

CKAN release 2.11 is expected to receive a dataset rendering enhancement. We should disable all customizations and evaluate the page loading speed after upgrading to CKAN 2.11, preferably on a catalog-next instance. If the speed improvement is significant, we can remove all customizations to simplify the system.

[btylerburton]

We've set an arbitrary milestone of 10/24 to check if CKAN has released 2.11 yet.