Sign Windows release binaries

[rquitales]

Proposed changes

This PR adds a new Makefile target make sign-goreleaser-exe target to sign all built GoReleaser windows binaries. This PR contains 2 changes:

• Makefile target
• Copied ci-mgmt workflow files for validation purposes (generated from: Add windows signing for native provider releases ci-mgmt#1318)

Please see the linked ci-mgmt issue for status of GitHub actions workflows to validate that the binaries are signed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.33%. Comparing base (2347595) to head (da780a2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   33.33%   33.33%           
=======================================
  Files          24       24           
  Lines         978      978           
=======================================
  Hits          326      326           
  Misses        605      605           
  Partials       47       47           

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