[release-1.32] Add Release downstream components in release workflow

[rafaelbreno]

Proposed Changes

Add an automatic release trigger for RKE2's downstream components:

• rke2-upgrade
• system-agent-installer-rke2

Types of Changes

New feature:

• A new step will be appended to release.yml workflow

Verification

Testing

Linked Issues

#7592

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.00%. Comparing base (4e779f8) to head (d3be787).
Report is 6 commits behind head on release-1.32.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.32    #7597      +/-   ##
================================================
+ Coverage         22.97%   23.00%   +0.02%     
================================================
  Files                34       34              
  Lines              3499     3500       +1     
================================================
+ Hits                804      805       +1     
  Misses             2647     2647              
  Partials             48       48              

Flag	Coverage Δ
inttests	8.74% <ø> (+0.02%)	⬆️
unittests	16.32% <ø> (-0.01%)	⬇️

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