Remove reconciler for spec v1alpha3 version

[baijum]

Signed-off-by: Baiju Muthukadan baiju.m.mail@gmail.com

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  included if any changes are user facing
• Tests
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[sadlerap]

Is it also safe to no longer register v1alpha3 resources with our known schemes? If so, we can also probably remove line 64 in main.go (and the import as well).

[codecov]

Codecov Report

Merging #1334 (1d3595d) into master (7136c43) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1334   +/-   ##
=======================================
  Coverage   58.16%   58.16%           
=======================================
  Files          35       35           
  Lines        3007     3007           
=======================================
  Hits         1749     1749           
  Misses       1090     1090           
  Partials      168      168           

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[baijum]

Is it also safe to no longer register v1alpha3 resources with our known schemes? If so, we can also probably remove line 64 in main.go (and the import as well).

I think it's okay to remove that registration. I have updated the PR with some other cleanup also. Please check again.

[sadlerap]

/lgtm
/approve

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