Description of problem:

PipelineRuns, TaskRuns & enforcedConfigLevel fields getting added inside namespaces block when setting namespace level config for tektonpruner

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

Steps to Reproduce

1. Install 1.21 OSP
2. Disable old pruner & enable tektonpruner
3. Set enforcedConfigLevel from global to namespace
4. Set fields successfulHistoryLimit, ttlSecondsAfterFinished in namespace block for test namespace

Actual results:

PipelineRuns, TaskRuns & enforcedConfigLevel fields getting added inside namespaces block when setting namespace level config.

enforcedConfigLevel shouldn't be updating again under namespace block as we are controlling at root level.

tektonpruner:
    disabled: false
    global-config:
      enforcedConfigLevel: namespace
      failedHistoryLimit: 7
      historyLimit: 10
      namespaces:
        dev:
          PipelineRuns: null
          TaskRuns: null
          enforcedConfigLevel: null
          failedHistoryLimit: null
          historyLimit: null
          successfulHistoryLimit: 3
          ttlSecondsAfterFinished: 300
      successfulHistoryLimit: null
      ttlSecondsAfterFinished: 6000
 

Expected results:

The above configured fields should be set and other default fields should be set to null

Reproducibility (Always/Intermittent/Only Once):

Acceptance criteria: 

Definition of Done:

Build Details:

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

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