WRKLDS-1676: Delete unused pkg/serviceaccounts

[tchap]

Once the unused function RunServiceAccountPullSecretsController
is removed and a few constants pulled out of the package,
it is actually unused and can be deleted.

[openshift-ci-robot]

@tchap: This pull request references WRKLDS-1676 which is a valid jira issue.

Details

In response to this:

Once the unused function RunServiceAccountPullSecretsController
is removed and a few constants pulled out of the package,
it is actually unused and can be deleted.

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[sanchezl]

/lgtm

[openshift-ci]

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[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-openshift-controller-manager
This PR has been included in build ose-openshift-controller-manager-container-v4.20.0-202505271846.p0.g7360d9f.assembly.stream.el9.
All builds following this will include this PR.