Summary:
D54654 added a third createDropTableTask (slow_queries_data) to
createDropSystemPlatformDBTablesTask(), but ConfigureDBApisTest.testDisableDbApis
still expected only two DropTable subtasks, so the task-ordering assertion failed
(position 8 expected ChangeAdminPassword but was DropTable), breaking the YBA unit
build on master.

Update the expected sequence to three DropTable tasks.

Test Plan:
cd managed && sbt "testOnly com.yugabyte.yw.commissioner.tasks.upgrade.ConfigureDBApisTest"
(JDK 17 + node 22) -> Passed: Total 2, Failed 0, Errors 0, Passed 2.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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_automated · Claude Code (Opus 4.8)_

Reviewers: nsingh, dshubin

Reviewed By: nsingh, dshubin

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D54977