Reset Manager DV - Block-level env to be imported from OT

[martin-velay]

• Be able to run the nightly regressions from OpenTitan with a similar pass rate.
• Add the DV to the nightly run.
• Don't vendor in any new OpenTitan blocks.

[KinzaQamar]

• Issues fixed
  • rstmgr_smoke test fixed by #28260 in OT
  • Replaced LC related resets with equivalent resets in Mocha
  • Fixed CascadedAssetSysToSys assertion --- Replaced that assertion with multiple CascadedAssert for resets that can be assert by rst_sys_src_n in Mocha

[KinzaQamar]

See notes 506#issuecomment-4450117925