chore: remove unused code

[lburgazzoli]

• chore: remove unused TrimToRFC1123Name function
• chore: remove unused pkg/cluster/roles functions
• chore: remove unused pkg/cluster/resources functions

Description

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• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ykaliuta

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.72%. Comparing base (2258161) to head (9b25f0b).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1543      +/-   ##
==========================================
+ Coverage   19.69%   19.72%   +0.02%     
==========================================
  Files         160      159       -1     
  Lines       10985    10862     -123     
==========================================
- Hits         2163     2142      -21     
+ Misses       8594     8492     -102     
  Partials      228      228              

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