planner: report warning when mpp join can't be selected whether it is MPPTask.#26487
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What problem does this PR solve?
Issue Number: close #xxx
Problem Summary: #26246 add warnings about joins when tidb_enforce_mpp is enabled, but there is an assumption that the task type is 'MPPTask'. Unfortunately, this is not true, but #25450 will make at least one of the planned explorations when enforce_mpp is turned on to be mpp_enforce=true.
What is changed and how it works?
Proposal: xxx
What's Changed: report warning when mpp join can't be selected whether it is MPPTask.
Check List
Tests
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