[improvement] set securityContext and use affinity instead of nodeSelector

[AshleyDumaine]

This PR adds compatibility for clusters running RKE2 on top of Linode infrastructure without needing to modify the manifests or helm chart values. Security contexts are set for the case of running with CIS hardening on RKE2 clusters.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.07%. Comparing base (1b9f2e7) to head (caacc51).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #318   +/-   ##
=======================================
  Coverage   71.07%   71.07%           
=======================================
  Files          14       14           
  Lines        2320     2320           
=======================================
  Hits         1649     1649           
  Misses        515      515           
  Partials      156      156           

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[rahulait]

LGTM