[APP-511] fix: explore workspace initialization

[briangregoryholmes]

Brings elements of #8518 to the Explore Workspace to fix a few initialization bugs and clean things up for #8501.

Namely, this ensures that the VisualExploreEditing component doesn't render until an underlying exploreStore is available. This fixes a bug that prevented the VisualExploreEditing component from receiving updates to the ExploreState object.

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!

[ericokuma]

https://www.loom.com/share/22af73eb84724c1a8c16861cbe66b4b5?focus_title=1&muted=1&from_recorder=1