[component/ccr] Fix default service account name

[davidor]

What does this PR do?

Fixes the default service account name used by the cluster checks runner.

The KSM core was not working when running on the runners because they were using the wrong service account.

Describe your test plan

KSM core check should work properly when running on a cluster check runner.

[codecov-commenter]

Codecov Report

Merging #556 (61f3129) into main (2e9c140) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #556   +/-   ##
=======================================
  Coverage   58.51%   58.51%           
=======================================
  Files           3        3           
  Lines         135      135           
=======================================
  Hits           79       79           
  Misses         43       43           
  Partials       13       13           

Flag	Coverage Δ
unittests	58.51% <ø> (ø)

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