Who is Pawan Singh - Bhojpuri actor in Bigg Boss 19 finale; how is Neelam Giri connected to him?

In the blockbuster episode of Bigg Boss 19 finale, Bhojpuri singer Pawan Singh graced the stage and performed with Salman Khan and ex-contestant Neelam Giri.
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Bishnoi vs Bigg Boss? Pawan Singh ‘warned’ not to share stage with Salman Khan

Despite an alleged call from the Lawrence Bishnoi gang warning him not to share the stage with Salman Khan, Bhojpuri star Pawan Singh performed ‘Rajaji Ke Dilwa’ during the Bigg Boss finale.