feat: Confirm leaving Dashboard with unsaved changes

[ernestii]

Test plan:

• [x] Go to a saved dashboard, navigate away, it shouldn't show a confirmation modal
• [x] Go to a preset dashboard, navigate away, it shouldn't show a confirmation modal
• [x] Create a new dashboard with no charts, navigate away, it shouldn't show a confirmation modal
• [x] Create a new dashboard with at least 1 chart, navigate away (to another app page), it should show a confirmation modal
• [x] Create a new dashboard with at least 1 chart, navigate away (try to refresh page), it should show a confirmation modal
• [x] Create a new dashboard with at least 1 chart, click Save Dashboard, useConfirmExit shouldn't interfere with it

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f7630f2d83b53901c898b24b43983af3001e15e3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ------------ | ----- | | @hyperdx/app | Patch | | @hyperdx/api | Patch |

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