delete unstable tests and skip redis tests if the redis extension is not installed

[godruoyi]

This test has always been unstable here, we've directly deleted it and no longer recommend using the default RandomSequenceResolver. If you need to ensure your ID is unique, you might want to look at FileLockResolver.

public function test_batch_for_diff_instance_with_default_driver(): void
    {
        $ids = [];
        $count = 100_000; // 100k

        for ($i = 0; $i < $count; $i++) {
            $ids[(new Snowflake())->id()] = 1;
        }

        // This pattern will result in generating duplicate IDs.
        $this->assertGreaterThan(90000, count($ids));
    }

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.75%. Comparing base (dec895d) to head (7b8f18f).
Report is 6 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #78      +/-   ##
============================================
+ Coverage     98.71%   98.75%   +0.03%     
- Complexity       91       94       +3     
============================================
  Files             7        8       +1     
  Lines           234      240       +6     
============================================
+ Hits            231      237       +6     
  Misses            3        3              

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