Fix pivot table config after browser refresh

[goerch]

• 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!

Please advise if I should run additional checks or add a test case. Fix for #9489.

[goerch]

I'm still not sure if the repeated initialization via usePivotForExplore and dashboard-stores's sync is intentional.