Change setting's deprecation message wording

[pgomulka]

depending on whether a message is critical or warning a message should indicate to check breaking changes documentation (critical level) or deprecation changes documentation (warn level)

relates #79666

[pgomulka]

ok to test

[pgomulka]

@elasticmachine update branch

[elasticsearchmachine]

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

[grcevski]

@pgomulka This looks like an older PR, but the change looks good to me. Have we decided if we wanted to proceed with this change? It appears that few other tests need to be adjusted.