Configurations in tektonconfig is not persisting after operator upgrade

Description of problem:

Configurations in tektonconfig is not persisting after operator upgrade.

This issue was observed in our CI cluster, where we had set the enable-api-fields as alpha and after the upgrade of the operator from 1.13.1 to 1.14.0 (1.14.0 to 1.14.1), the tektonconfig contained enable-api-fields as alpha but the key enable-api-fields was not present in the feature-flags configmap in openshift-pipelines namespace

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

I could not reproduce the issue in a test cluster.

Actual results:

The configurations in tektonconfig is not persisting after the operator upgrade

Expected results:

The configurations in tektonconfig should persist even after operator upgrade

Reproducibility (Always/Intermittent/Only Once):

Only Once

Acceptance criteria: 

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

 *