Simulate rank_to_votes in pallet-ranked-collective benchmark. (#9731)

resolves #9730

---------

Co-authored-by: Bastian Köcher <[email protected]>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>
(cherry picked from commit 1cbf4ee)

Author: 3 people

prdoc/pr_9731.prdoc

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+title: simulate `rank_to_votes` conversion in vote benchmark
+
+doc:
+- audience: Runtime Dev
+  description: |
+    Fixes benchmarking failures for the vote extrinsic in pallet-ranked-collective by properly
+    simulating the `rank_to_votes` conversion process. Previously used hardcoded vote values
+    which caused assertion failures when using custom VoteWeight converters (e.g., in
+    [Ambassador Collective configuration](https://github.com/polkadot-fellows/runtimes/pull/736)). The fix calculates vote weight based on member's
+    actual rank and minimum required rank for the class.
+
+crates:
+- name: pallet-ranked-collective
+  bump: patch