[release-4.20] MGMT-21882: parse all the idms file entries when generating the RegistriesConf asset

[andfasano]

This is a manual cherry-pick of #545

[openshift-ci-robot]

@andfasano: This pull request references MGMT-21882 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target only the "4.20.0" version, but multiple target versions were set.

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In response to this:

This is a manual cherry-pick of #545

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[andfasano]

/assign @danielerez

[bfournie]

/lgtm

[danielerez]

/approve

[openshift-ci]

@andfasano: The following test 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-sno-dualstack-dhcp	6827e1c	link	false	/test e2e-sno-dualstack-dhcp

Full PR test history. Your PR dashboard.

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andfasano, danielerez

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