feat(alerts): toggle alert threshold lines

[anirudhpillai]

Problem

Alert threshold lines were visible by default on the insight.

Changes

• Adds option to let users toggle the threshold lines.
• Fix bug to hide null thresholds

Does this work well for both Cloud and self-hosted?

N/A

How did you test this code?

Tested locally

[github-actions]

Size Change: 0 B

Total Size: 1.14 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.14 MB

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📸 UI snapshots have been updated

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• webkit: 0 added, 0 modified, 0 deleted

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