cherry-pick: refactor dashboard manifests

[zdtsw]

partially cherrypick opendatahub-io#1065
to keep other part not included, which will be done in "sync" PR

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Description

JIRA issue:

ref: https://issues.redhat.com/browse/RHOAIENG-8510

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[openshift-ci]

@zdtsw: 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/rhoai-operator-pr-image-mirror	c0c6628	link	true	/test rhoai-operator-pr-image-mirror
ci/prow/rhoai-operator-e2e	c0c6628	link	true	/test rhoai-operator-e2e

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[zdtsw]

/test rhoai-operator-e2e

[VaishnaviHire]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: VaishnaviHire, zdtsw

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