[release-1.13] Ignore no match errors on deleting obsolete resources

[knative-prow-robot]

This is an automated cherry-pick of #1739

[houshengbo]

/lgtm
/approve

[knative-prow]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 63.54%. Comparing base (c6d9b0e) to head (436f493).
Report is 2 commits behind head on release-1.13.

Files	Patch %	Lines
pkg/reconciler/common/stages.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.13    #1740      +/-   ##
================================================
- Coverage         63.60%   63.54%   -0.06%     
================================================
  Files                53       53              
  Lines              2580     2584       +4     
================================================
+ Hits               1641     1642       +1     
- Misses              825      827       +2     
- Partials            114      115       +1     

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