chore: benchmark `provide_shared_data` for the election pallet

[syan095]

Pull Request

Closes: PRO-1579

Checklist

Please conduct a thorough self-review before opening the PR.

• [x] I am confident that the code works.
• [x] I have written sufficient tests.
• [x] I have written and tested required migrations.
• [x] I have updated documentation where appropriate.

Summary

Added benchmarking code for provide_shared_data for the election pallet.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 15.51724% with 49 lines in your changes missing coverage. Please review.

Project coverage is 70%. Comparing base (098850e) to head (efaa65b). Report is 4 commits behind head on main.

Files	Patch %	Lines
state-chain/pallets/cf-elections/src/weights.rs	0%	48 Missing :warning:
state-chain/node/src/chain_spec.rs	0%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5168 +/- ## ===================================== - Coverage 70% 70% -0% ===================================== Files 481 481 Lines 85991 85963 -28 Branches 85991 85963 -28 ===================================== - Hits 60303 60218 -85 - Misses 22420 22467 +47 - Partials 3268 3278 +10 ```

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