[Rest Api Compatibility] Allow copy_settings flag for resize operations

[pgomulka]

previously removed in #38514, deprecated in 7.x and defaulted to true.
With rest api compatibility and when value is true it is ignored and warning is emitted
when value is false, an exception is thrown

relates #51816

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[elasticmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[pgomulka]

@elasticmachine update branch

[jkakavas]

LGTM!