[Improvement-8874][API] Fix create&update workflow cron APIs, verify the end time must bigger than start time

[Tianqi-Dotes]

Purpose of the pull request

This PR fix create & update workflow cron APIs, verify the end time must be bigger than the start time

Brief change log

fix workflow cron time verification

Verify this pull request

This pull request is code cleanup without any test coverage.

(or)

This pull request is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

[caishunfeng]

LGTM

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.29%. Comparing base (a9c9eb0) to head (8778000).
⚠️ Report is 2818 commits behind head on dev.

Files with missing lines	Patch %	Lines
...heduler/api/service/impl/SchedulerServiceImpl.java	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #8871      +/-   ##
============================================
- Coverage     45.31%   45.29%   -0.03%     
- Complexity     4077     4081       +4     
============================================
  Files           702      702              
  Lines         27111    27177      +66     
  Branches       2897     2909      +12     
============================================
+ Hits          12285    12309      +24     
- Misses        13674    13706      +32     
- Partials       1152     1162      +10     

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[sonarqubecloud]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication