Encapsulate the filter/sort info so that separate tabs don’t interfere with each other

[bhilbert4]

Filter/sort information appears not to be session-specific. With two tabs open on different observations, the filter/sort information is shared between sessions, which breaks e.g. the Back button

[bhilbert4]

@BradleySappington do you know if this is still an issue?

[BradleySappington]

Confirmed still an issue

[bhilbert4]

This issue wasn't transferred to Jira by the bot for whatever reason. So we re-created the issue on JIRA. The mirrored github issue is #1572