This PR adds to Explore the same support for default filters recently added to Canvas.

TO DO:

• Ensure this system interacts well with bookmarks on cloud
• Fix tests
• Check filter cleanirg behavior
• Check sorting behavior
• Move placement of save defaults button to match Canvas (Is this the intention? @Di7design @ericokuma)
• Cleanup and efficiency improvements (especially when deriving the viewing defaults flag)
• Add default state preview to sidebar
• Initialize include/exclude mode map

Open questions:

• As has been the case for a while, it is impossible for the average user to easily return to the default state. In the current implementation of Explore, clearing the filter parameters from the URL takes you back to the most recent state, which is a frustrating experience. I advocate for matching the behavior on Canvas, where recent state is no longer stored in localStorage, but only in JavaScript land.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!