[Bug] Return error if user failed to pause/resume a certain routine load job

[morningman]

Proposed changes

When operating a single job, maintain the same behavior as before

This problem is introduced by #6394.

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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Checklist

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• I have created an issue on (Fix #ISSUE) and described the bug/feature there in detail
• Compiling and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
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Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[EmmyMiao87]

LGTM

[github-actions]

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

[github-actions]

PR approved by anyone and no changes requested.