Reduce deployment updates

[norman465]

Proposed Changes

• eliminate redundant deployment updates
• if anything modifies the deployment spec of a knative managed deployment the current logic will do a redundant deployment update every reconile. This is i.e. visible when running with net-istio, which adds

        service.istio.io/canonical-name:
        service.istio.io/canonical-revision:

to spec.template.metadata.labels causing the semantic equality check to fail every reconile.

Release Note

NONE

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: norman465
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.19%. Comparing base (4004491) to head (a573615).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16361      +/-   ##
==========================================
+ Coverage   80.14%   80.19%   +0.04%     
==========================================
  Files         216      216              
  Lines       13440    13440              
==========================================
+ Hits        10772    10778       +6     
+ Misses       2301     2300       -1     
+ Partials      367      362       -5     

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