[Enhancement] prefer four-phase plan for distinct aggregation in single node env when group by column is skew (backport #64668)

[mergify]

Why I'm doing:

This is a follow up pr of #63724.

What I'm doing:

test as below:

before(2-stage agg):

$ mysqlslap --concurrency=1     --iterations=3     --query="/home/ubuntu/lism/q9.sql"     --delimiter=";" -h 127.0.0.1  -P 9130 -u root  --create-schema=hits
Benchmark
        Average number of seconds to run all queries: 0.308 seconds
        Minimum number of seconds to run all queries: 0.304 seconds
        Maximum number of seconds to run all queries: 0.311 seconds
        Number of clients running queries: 1
        Average number of queries per client: 2

after(4-stage agg with #63660):

$ mysqlslap --concurrency=1     --iterations=3     --query="/home/ubuntu/lism/q9.sql"     --delimiter=";" -h 127.0.0.1  -P 9130 -u root  --create-schema=hits
Benchmark
        Average number of seconds to run all queries: 0.202 seconds
        Minimum number of seconds to run all queries: 0.191 seconds
        Maximum number of seconds to run all queries: 0.219 seconds
        Number of clients running queries: 1
        Average number of queries per client: 1

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 4.0
  • 3.5
  • 3.4
  • 3.3

---

This is an automatic backport of pull request #64668 done by [Mergify](https://mergify.com).

[mergify]

🧪 CI Insights

Here's what we observed from your CI run for f72bc28.

🟢 All jobs passed!

But CI Insights is watching 👀