Revisit frequently used mediator pages

[chanikag]

Description

This task is to improve following mediator pages

• 1. Validate Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/validate-mediator
• 2. Property Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/property-mediator
• 3. Property Group Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/property-group-mediator
• 4. Drop Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/drop-mediator
• 5. PayloadFactory Mediator - https://mi.docs.wso2.com/en/4.3.0/reference/mediators/payloadfactory-mediator

Describe the problem(s)

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Describe your solution(s)

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[chanikag]

Drop mediator refactored via #979

[chanikag]

Guide: https://docs.google.com/document/d/1_9Ca2Kilrw-a73TBKt5MdEt4EkrCswCBoF9aFXfQRis/edit

[chanikag]

Property and Property Group Mediator contents are refactored via #1041

[chanikag]

Validate mediator content change via #1056