fix: remove global var for System tags, pass systemTags from runtime

[michaelhtm]

Issue #2673

Description of changes:
This change ensures the system tags ignored are
passed by runtime, instead of hard coding a specific value.

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This pull-request has been approved by: a-hilaly, michaelhtm

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[a-hilaly]

/test s3-controller-test

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@michaelhtm: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ec2-controller-test	5452297	link	true	/test ec2-controller-test
verify-attribution	dbadfc5	link	false	/test verify-attribution
s3-olm-test	dbadfc5	link	false	/test s3-olm-test
s3-controller-test	dbadfc5	link	true	/test s3-controller-test

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