planner: fix panic of aggregation distinct function when distinct_agg…

[zoomxi]

What problem does this PR solve?

Issue Number: close #24449

Problem Summary:

• when tidb_opt_distinct_agg_push_down and tidb_enable_cascades_planner are open, if agg are Partially pushed down, the InjectProjectionBelowAgg will not be matched, so the groupExpr will be wrong.

What is changed and how it works?

What's Changed:

• logical_plans.go
• transformation_rules.go

How it Works:

• update IsCompleteModeAgg to find if any of aggFuncs are CompleteMode, not just compare the first aggFunc
• if aggFunc input is from 'partial data', no need to wrap cast for agg args

Check List

Tests

• [*] Unit test
• [*] Manual test (add detailed scripts or steps below)

Release note

• No release note

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[zoomxi]

/cc @tisonkun @eurekaka @winoros @SunRunAway @qw4990 @time-and-fate @zhouqiang-cl please have a code review, thanks

[ti-chi-bot]

@zoomxi: PR needs rebase.

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