[dashboards] Change analyzed_spans -> spans

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#815

[therve]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #649 (5afa8d1) into master (a780935) will decrease coverage by 0.14%.
The diff coverage is 0.00%.

Impacted Files	Coverage Δ	Complexity Δ
...ient/model/FormulaAndFunctionEventsDataSource.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../v1/client/model/SyntheticsConfigVariableType.java	0.00% <0.00%> (-54.55%)	0.00% <0.00%> (-3.00%)
.../api/v1/client/model/SyntheticsConfigVariable.java	0.00% <0.00%> (-21.43%)	0.00% <0.00%> (-5.00%)
...model/SyntheticsAssertionJSONPathTargetTarget.java	0.00% <0.00%> (-20.00%)	0.00% <0.00%> (-4.00%)
...ent/model/SyntheticsAssertionJSONPathOperator.java	63.63% <0.00%> (-18.19%)	4.00% <0.00%> (-1.00%)
...client/model/SyntheticsTestRequestCertificate.java	0.00% <0.00%> (-17.86%)	0.00% <0.00%> (-3.00%)
...lient/model/SyntheticsAssertionJSONPathTarget.java	2.38% <0.00%> (-14.29%)	1.00% <0.00%> (-3.00%)
...nt/model/SyntheticsTestRequestCertificateItem.java	0.00% <0.00%> (-14.29%)	0.00% <0.00%> (-3.00%)
...tadog/api/v1/client/model/SyntheticsAssertion.java	52.63% <0.00%> (-11.85%)	5.00% <0.00%> (-1.00%)
...i/v1/client/model/SyntheticsAssertionOperator.java	86.95% <0.00%> (-8.70%)	5.00% <0.00%> (-1.00%)
... and 2 more