OCPBUGS-58023: Prevent unnecessary systemd unit disable

[RishabhSaini]

- What I did
helpers: Compute systemdUnits that added and changed between Ign configs
update: Only write added or updated systemd units

- How to verify it
Verify that while updating a node from 1 MC to another MC, the unchanged systemd units are not unnecessarily disabled

- Description for the changelog

[openshift-ci-robot]

@RishabhSaini: This pull request references Jira Issue OCPBUGS-58023, which is invalid:

• expected the bug to target the "4.20.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to this:

- What I did
helpers: Compute systemdUnits that added and changed between Ign configs
update: Only write added or updated systemd units

- How to verify it
Verify that while updating a node from 1 MC to another MC, the unchanged systemd units are not unnecessarily disabled

- Description for the changelog

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RishabhSaini

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Needs approval from an approver in each of these files:

• OWNERS [RishabhSaini]

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[RishabhSaini]

/jira refresh

[openshift-ci-robot]

@RishabhSaini: This pull request references Jira Issue OCPBUGS-58023, which is valid. The bug has been moved to the POST state.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.20.0) matches configured target version for branch (4.20.0)
• bug is in the state ASSIGNED, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @sergiordlr

In response to this:

/jira refresh

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci]

@RishabhSaini: 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
ci/prow/e2e-gcp-op-techpreview	fd0f520	link	false	/test e2e-gcp-op-techpreview
ci/prow/e2e-gcp-op-ocl	fd0f520	link	false	/test e2e-gcp-op-ocl
ci/prow/e2e-aws-ovn-upgrade	fd0f520	link	true	/test e2e-aws-ovn-upgrade
ci/prow/e2e-azure-ovn-upgrade-out-of-change	fd0f520	link	false	/test e2e-azure-ovn-upgrade-out-of-change

Full PR test history. Your PR dashboard.

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