RHOAIENG-4992 - Remove useMergedBuildTestPipeline parameter from gito…

[MarianMacik]

…ps pipeline

JIRA: RHOAIENG-4492

Description

The parameter is not needed now as we no longer have separate build & test pipelines.

How Has This Been Tested?

Testing by running the gitops-update-pipeline, the output of it is the testing PR https://github.com/MarianMacik/ai-edge/pull/2

Merge criteria:

• [x] The commits are squashed in a cohesive manner and have meaningful messages.
• [x] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [x] The developer has manually tested the changes and verified that the changes work

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adelton, MarianMacik

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/opendatahub-io/ai-edge/blob/main/OWNERS)~~ [MarianMacik,adelton] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment