add ToolchainCluster to client cache

[MatousJobanek]

add ToolchainCluster to client cache to match the Role in the registration-service template in host-operator repo. see codeready-toolchain/host-operator#1089

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexeykazakov, MatousJobanek, rajivnathan

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.45%. Comparing base (36ce810) to head (04824e2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #463   +/-   ##
=======================================
  Coverage   79.45%   79.45%           
=======================================
  Files          42       42           
  Lines        2726     2726           
=======================================
  Hits         2166     2166           
  Misses        471      471           
  Partials       89       89           

Flag	Coverage Δ
unittests	79.45% <ø> (ø)

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