Add conversations support for Responses API: modifications from reviews #824

Namespace: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/lightspeed-core-tenant" rel="nofollow">lightspeed-core-tenant
PipelineRun: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/lightspeed-core-tenant/pipelinerun/lightspeed-stack-on-pull-request-rv4bc" rel="nofollow">lightspeed-stack-on-pull-request-rv4bc

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