*: Refine logging for rough set filter

[JaySon-Huang]

What problem does this PR solve?

Issue Number: ref https://github.com/pingcap/tiflash/issues/6233

Problem Summary:

• It is odd to see DB::buildPushDownFilter is being called in PushDownFilter::build, moving that function to be DAGExpressionAnalyzer::buildPushDownFilter is more reasonable
• The content in Unsupported RSOperator is verbose and useless, replace it by a string with sufficient message

What is changed and how it works?

• Remove the verbose string pb.ShortDebugString when the rough set filter is not supported
• Move DB::buildPushDownFilter -> DAGExpressionAnalyzer::buildPushDownFilter
• Replace some stringstream by FmtBuffer in ExpressionActions

Check List

Tests

• [ ] Unit test
• [ ] Integration test
• [x] Manual test (add detailed scripts or steps below)
• [ ] No code

Side effects

• [ ] Performance regression: Consumes more CPU
• [ ] Performance regression: Consumes more Memory
• [ ] Breaking backward compatibility

Documentation

• [ ] Affects user behaviors
• [ ] Contains syntax changes
• [ ] Contains variable changes
• [ ] Contains experimental features
• [ ] Changes MySQL compatibility

Release note

None

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JinheLin, Lloyd-Pottiger

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tiflash/blob/master/OWNERS)~~ [JinheLin,Lloyd-Pottiger] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-06-14 15:17:00.400014162 +0000 UTC m=+736974.453326086: :ballot_box_with_check: agreed by JinheLin.
• 2024-06-16 02:20:18.966410458 +0000 UTC m=+863173.019722382: :ballot_box_with_check: agreed by Lloyd-Pottiger.

[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

New changes are detected. LGTM label has been removed.