fix: log seed when only sequence.shuffle.tests is enabled

[kaigritun]

Summary

This PR fixes #9557 where the seed is not logged when only sequence.shuffle.tests is enabled.

The Problem

When using the config:

sequence: {
  shuffle: {
    tests: true
  }
}

The seed was not being logged, even though it's used to shuffle tests within files.

The Fix

Two changes:

1. In resolveConfig.ts: Set the seed when either files OR tests are shuffled
2. In logger.ts: Log the seed when either files (RandomSequencer) or tests are shuffled

Root Cause

The original code only checked if RandomSequencer was being used, but RandomSequencer is only set when shuffle.files is true. When only shuffle.tests is true, BaseSequencer is used but the seed is still needed for shuffling tests.

Testing

• Verified the fix with the reproduction from the issue
• Ran existing sequencer tests (all pass)
• The random.test.ts test was already flaky before this change (unrelated issue)

[sheremet-va]

Thank you for your contribution. We should add a test confirming the seed is shown. You can see examples in test/cli. Prefer runInlineTests

[sheremet-va]

We don’t use changeset, this file can be deleted

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[kaigritun]

Added tests using runInlineTests in test/cli/test/seed-logging.test.ts:

1. Seed is shown when sequence.shuffle.tests is true
2. Seed is shown when sequence.shuffle.files is true
3. Seed is shown when both shuffle options are enabled

Ready for re-review!

[sheremet-va]

Ready for re-review!

You missed the review comments regarding changeset

[kaigritun]

Removed the changeset file - apologies for missing that inline comment!