fix: pivot rows reactivity issue

[AdityaHegde]

Table options was a constant and it never recomputed if args change without a remount. This was an issue only in canvas with tabs, each tab with the exact same pivot but with different filters.

Making the options store reactive so that changes in pivotDataStore / pivotState updates the table correctly.

Closes APP-925

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!