Fix rootcoord restoration misses gcConfirmStep

[congqixia]

See also #25279
/kind bug

[sre-ci-robot]

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• internal/rootcoord/OWNERS [congqixia]

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[longjiquan]

/lgtm

[longjiquan]

Thx for the great fix.

[czs007]

@congqixia need to pick to master

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[congqixia]

@congqixia need to pick to master

@czs007 done: #25293

[codecov]

Codecov Report

Merging #25280 (3201f76) into 2.2.0 (4b916f2) will decrease coverage by 0.03%.
The diff coverage is 59.09%.

@@            Coverage Diff             @@
##            2.2.0   #25280      +/-   ##
==========================================
- Coverage   80.63%   80.60%   -0.03%     
==========================================
  Files         761      761              
  Lines      107547   107583      +36     
==========================================
- Hits        86725    86722       -3     
- Misses      17496    17527      +31     
- Partials     3326     3334       +8     

Impacted Files	Coverage Δ
internal/querynode/plan.go	68.61% <40.00%> (-3.27%)	⬇️
internal/rootcoord/garbage_collector.go	98.36% <100.00%> (+0.06%)	⬆️

... and 25 files with indirect coverage changes

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