Remove git files from kodata

[dprotaso]

see: knative/pkg#2548

Proposed Changes

• drop kodata/HEAD kodata/refs from container images
• build info (vcs.revision) is now embedded in the go binary with go1.18

Release Note

Build commit SHA is no longer under kodata in our containers it is now embedded in the binary since we build with go1.18. Use `go version -m [binary]` to get the same information

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[codecov]

Codecov Report

Merging #13130 (b6267cd) into main (d366049) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #13130      +/-   ##
==========================================
+ Coverage   86.78%   86.84%   +0.05%     
==========================================
  Files         196      196              
  Lines       14410    14410              
==========================================
+ Hits        12506    12514       +8     
+ Misses       1609     1603       -6     
+ Partials      295      293       -2     

Impacted Files	Coverage Δ
pkg/activator/net/revision_backends.go	93.35% <0.00%> (+0.57%)	⬆️
pkg/reconciler/configuration/configuration.go	85.20% <0.00%> (+1.53%)	⬆️
pkg/reconciler/revision/background.go	92.72% <0.00%> (+1.81%)	⬆️

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[dprotaso]

/assign @nader-ziada

[nader-ziada]

/lgtm