NO-ISSUE: remove sed in post pivot flow as logic was moved to recert

[tsorya]

Background / Context

This logic was moved to recert so there is no need to run sed anymore.

Related recert PR: https://github.com/rh-ecosystem-edge/recert/pull/147

Issue / Requirement / Reason for change

Solution / Feature Overview

Implementation Details

Other Information

[openshift-ci-robot]

@tsorya: This pull request explicitly references no jira issue.

In response to [this](https://github.com/openshift-kni/lifecycle-agent/pull/580): > > ># Background / Context >This logic was moved to recert so there is no need to run sed anymore > > ># Issue / Requirement / Reason for change > > > ># Solution / Feature Overview > > > ># Implementation Details > > > ># Other Information > > > > > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift-kni%2Flifecycle-agent). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci-robot]

@tsorya: This pull request explicitly references no jira issue.

In response to [this](https://github.com/openshift-kni/lifecycle-agent/pull/580): > > ># Background / Context >This logic was moved to recert so there is no need to run sed anymore. > >Related recert PR: https://github.com/rh-ecosystem-edge/recert/pull/147 > > ># Issue / Requirement / Reason for change > > > ># Solution / Feature Overview > > > ># Implementation Details > > > ># Other Information > > > > > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift-kni%2Flifecycle-agent). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.