fix: First response time livechat metrics are associated with the last agent who served the room (#34156)

Co-authored-by: Douglas Fabris <27704687+dougfabris@users.noreply.github.com>

Co-authored-by: Tasso <tasso.evangelista@rocket.chat>

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Co-authored-by: Douglas Gubert <douglas.gubert@gmail.com>
Co-authored-by: Kevin Aleman <kaleman960@gmail.com>

Co-authored-by: dougfabris <devfabris@gmail.com>

Co-authored-by: Gustavo Reis Bauer <gustavoreisbauer@gmail.com>
Co-authored-by: Pierre Lehnen <55164754+pierre-lehnen-rc@users.noreply.github.com>
Co-authored-by: Marcos Spessatto Defendi <marcos.defendi@rocket.chat>
Co-authored-by: Pierre <pierre.lehnen@rocket.chat>
Co-authored-by: Rafael Tapia <rafael.tapia@rocket.chat>
Co-authored-by: matheusbsilva137 <matheus_barbosa137@hotmail.com>
Co-authored-by: Kevin Aleman <kaleman960@gmail.com>
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Co-authored-by: Kevin Aleman <11577696+KevLehman@users.noreply.github.com>
Co-authored-by: Tasso Evangelista <2263066+tassoevan@users.noreply.github.com>

Co-authored-by: Tiago Evangelista Pinto <17487063+tiagoevanp@users.noreply.github.com>