Switching KMM to work with the new build/sign flow

[yevgeny-shnaidman]

changing the manager's main to use MIC and MBSC reconcilers instead of BuildSignReconciler

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.

Project coverage is 74.63%. Comparing base (fa23a9b) to head (3ce9831). Report is 248 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/manager/main.go	0.00%	10 Missing :warning:
internal/controllers/mbsc_reconciler.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1060      +/-   ##
==========================================
- Coverage   79.09%   74.63%   -4.46%     
==========================================
  Files          51       77      +26     
  Lines        5109     6865    +1756     
==========================================
+ Hits         4041     5124    +1083     
- Misses        882     1529     +647     
- Partials      186      212      +26     

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[ybettan]

/lgtm