Add a test for Ilab KFP pipeline

[VaniHaripriya]

This issue resolves RHOAIENG-16508

Description

• Added a new test to test the successful run completion of iLab pipeline.
• When given a Pipeline Server, with the Ilab pipeline imported, the test will:

1. Start the pipeline with a set of reasonable input parameters for testing successful run.
2. Confirm the pipeline runs successfully.

How Has This Been Tested?

• Used dsp-non-fips cluster - RHOAI cluster
• Selected an existing pipeline to execute the test- rmartine-ilab.
• Set the environment variables ENABLE_ILAB_PIPELINE_TEST , PIPELINE_SERVER_URL, BEARER_TOKEN, PIPELINE_DISPLAY_NAME .
• Since the cluster uses self-signed certificates, added and trusted the certificates before executing the test.
• Executed the test using below command-
  go test -run TestPipelineRun -v -timeout 180m ./standalone/e2e/

Merge criteria:

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

[VaniHaripriya]

Attaching the pipeline run which was completed successfully using this test.