[Improvement][master-sql] Optimize the sql for queryTheHighestPriorityTasks

[hiSandog]

The previous sql was not only semantically ambiguous, but also inefficient.
So I made some small improvements

[codecov-commenter]

Codecov Report

Merging #13671 (34d6517) into dev (fd72088) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 34d6517 differs from pull request most recent head 39e1c35. Consider uploading reports for the commit 39e1c35 to get more accurate results

@@             Coverage Diff              @@
##                dev   #13671      +/-   ##
============================================
+ Coverage     39.15%   39.17%   +0.01%     
  Complexity     4426     4426              
============================================
  Files          1129     1129              
  Lines         42121    42121              
  Branches       4776     4776              
============================================
+ Hits          16491    16499       +8     
+ Misses        23814    23805       -9     
- Partials       1816     1817       +1     

Impacted Files	Coverage Δ
...r/plugin/task/sqoop/parameter/SqoopParameters.java	38.09% <0.00%> (-1.20%)	⬇️
...r/plugin/registry/zookeeper/ZookeeperRegistry.java	50.80% <0.00%> (+7.25%)	⬆️

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[sonarcloud]

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