Fix BrowserWebVitalsPerfData clsTime to cls and make it double type.

[wankai123]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes [Bug] com.google.protobuf.InvalidProtocolBufferException: Not an int32 value #13596.
• Update the CHANGES log.

[Copilot]

Pull request overview

This PR fixes the Cumulative Layout Shift (CLS) metric handling in the browser performance monitoring system by renaming clsTime to cls and changing its type from integer to double. CLS is a unitless score (not a time measurement), so the change aligns the field name and type with the metric's actual nature.

• Renamed field from clsTime to cls across the codebase
• Changed CLS type from int to double to properly represent the decimal score
• Added conversion logic to scale CLS by 1000 before storing as integer

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
BrowserWebVitalsPerfDataAnalysisListener.java	Updated to call getCls() and multiply by 1000 before storing as int
BrowserWebVitalsPerfDataDecorator.java	Changed getter method from getClsTime() returning int to getCls() returning double
BrowserAppWebVitalsPerf.java	Renamed field from clsTime to cls
changes.md	Added changelog entry documenting the fix
browser-protocol.md	Updated documentation example showing CLS as 0.1 instead of 10
apm-network/src/main/proto	Updated subproject commit reference

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[wu-sheng]

Agent side code mergrd. We should update e2e for it?