feat: NR 328461 add CLS browser golden signals

[shivalagisetty]

Relevant information

The Browser is extending the support of CLS (Cumulative Layout Shift ) a core web vital which is missing as the other two are already added.

Ticket : https://new-relic.atlassian.net/browse/NR-328461

Checklist

• I've read the guidelines and understand the acceptance criteria.
• The value of the attribute marked as identifier will be unique and valid.
• I've confirmed that my entity type wasn't already defined. If it is I'm providing an explanation above.

[entityBot]

beep boop bop.

I have found some errors processing these changes:

* Error PARSING domainType: 'browser-application' on LinkedHashMap<String, entitydefinitionemitter.models.CustomSummaryMetricDefinition> - jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `entitydefinitionsclientmetrics.models.definitions.MetricUnit` from String "NUMBER": not one of the values accepted for Enum class: [MS, APDEX, MESSAGES_PER_SECOND, BYTES_PER_SECOND, BYTES, BITS_PER_SECOND, PAGES_PER_SECOND, TIMESTAMP, PERCENTAGE, HERTZ, CELSIUS, SECONDS, BITS, OPERATIONS_PER_SECOND, COUNT, REQUESTS_PER_SECOND, REQUESTS_PER_MINUTE, STRING]
at [Source: (StringReader); line: 15, column: 9] (through reference chain: LinkedHashMap["cumulativeLayoutShift75Percentile"]->entitydefinitionemitter.models.CustomSummaryMetricDefinition["unit"])

* Error PARSING domainType: 'browser-application' on LinkedHashMap<String, entitydefinitionemitter.models.CustomGoldenMetricDefinition> - jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `entitydefinitionsclientmetrics.models.definitions.MetricUnit` from String "NUMBER": not one of the values accepted for Enum class: [MS, APDEX, MESSAGES_PER_SECOND, BYTES_PER_SECOND, BYTES, BITS_PER_SECOND, PAGES_PER_SECOND, TIMESTAMP, PERCENTAGE, HERTZ, CELSIUS, SECONDS, BITS, OPERATIONS_PER_SECOND, COUNT, REQUESTS_PER_SECOND, REQUESTS_PER_MINUTE, STRING]
at [Source: (StringReader); line: 27, column: 9] (through reference chain: LinkedHashMap["cumulativeLayoutShift75Percentile"]->entitydefinitionemitter.models.CustomGoldenMetricDefinition["unit"])

[CLAassistant]

All committers have signed the CLA.

[otaviocarvalho]

We cannot arbitrarily add units on our side. Those need to be changed/allowed on the upstream systems before we can change our validations.

Added more context here: link

[vetusbs]

I don't think STRING is the proper unit here.

Is there any specific reason why this should be an STRING?

I totally understand that any other values in the ENUM do not fit completely your needs, but I'd not put an STRING here.

In many other places, we use just COUNT, which is the default.
The COUNT unit, is shown as no just a number in the UI.

Let me share some examples:

entity-definitions/entity-types/infra-container/summary_metrics.yml

Line 6 in 1ce56fe

cpuUsage:

entity-definitions/entity-types/infra-awslambdafunctionalias/golden_metrics.yml

Line 46 in 1ce56fe

throttles: