[8.10] [Synthetics] Refactor cardinality test runs query (#166608)

[shahzad31]

Backport

This will backport the following commits from main to 8.10:

• [Synthetics] Refactor cardinality test runs query (#166608)

Questions ?

Please refer to the Backport tool documentation

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💚 Build Succeeded

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• Commit: 9881d65

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
exploratoryView	200.7KB	200.6KB	-31.0B
synthetics	909.6KB	909.6KB	-11.0B
total			-42.0B

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@elasticmachine merge upstream