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What does this PR do?

Fix 2 bugs in the toJson logic for stage breakdowns:

1. String chars need to be escaped or we get invalid json (e.g. if a string contains " or \n)
2. Span tags cannot be greater than 5000 chars, so when we send huge json messages they get cropped and become invalid. If a json is now greater than 5000 chars, we don't include it.

Description of the Change

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• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
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