fix(pnl): Fix PNL ticks leaderboard test flakiness (backport #2738)

[mergify]

Problem

The PNL ticks leaderboard test was failing intermittently due to inconsistent date handling in the test data setup, where timestamps were being dynamically generated using JavaScript's DateTime, making the test results dependent on when the test was run.

Solution

Fixed the test data setup in pnl-ticks-table.test.ts to ensure consistent timestamp handling by:

1. Using DateTime.utc().startOf('day') to ensure all test data timestamps are aligned to UTC midnight
2. Ensuring both createdAt and blockTime fields use consistent timestamps in the test data
3. Properly aligning test data timestamps with PostgreSQL's date handling expectations

Test Plan

• Verified that "Get thirty days ranked pnl ticks" test now passes consistently
• Confirmed that other PNL ticks store tests continue to pass
• Ensured that the changes maintain the original business logic while fixing the timing issues

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• Manually add any of the following labels: refactor, chore, bug.

Summary by CodeRabbit

• Tests
  • Improved the simulation accuracy in our testing environment by replacing static timestamp values with dynamically calculated dates. This update provides more realistic test data, ensuring enhanced reliability during quality checks.

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This is an automatic backport of pull request #2738 done by [Mergify](https://mergify.com).

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