[test](case) add batch size in long time case

[Mryange]

Proposed changes

For even PRs, the batch size is set to 50, and this case runs for 50 minutes.

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[doris-robot]

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[Mryange]

run buildall

[github-actions[bot]]

PR approved by anyone and no changes requested.

[github-actions[bot]]

PR approved by at least one committer and no changes requested.