refactor: rename DataContractConfig.validate_config_update

[shumkov]

Issue being fixed or feature implemented

DataContract related structures has method validate_update to validate compartiblity as a part of Data Contract Update transition validation. For example, DocumentTypeRef.validate_update. There are more introduced in #1835. To keep consistent naming and remove repetition of meaning we need to rename DataContractConfig.validate_config_update

What was done?

• Renamed DataContractConfig.validate_config_update to DataContractConfig.validate_update

How Has This Been Tested?

None

Breaking Changes

None

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone