Fix testkube mongodb issue

[suyadav1]

This pull request updates the Testkube installation and testing scripts to improve reliability and ensure a clean test environment. The most important changes include switching the MongoDB Helm chart image to Bitnami, adding a cleanup step for existing Testkube installations, and increasing the wait time before running tests.

Helm Chart Image Update:

• Changed the MongoDB Helm chart image source from Azure Monitor to Bitnami, updating the registry to docker.io, repository to bitnami/mongodb, and tag to latest in helm-testkube-values.yaml.

Testkube Installation Script Improvements:

• Added logic to detect and clean up any existing Testkube installation by uninstalling the Helm release and deleting the namespace before proceeding with a new install in install-and-execute-testkube-tests.sh.

Test Execution Reliability:

• Increased the wait time after applying the test CRs from 120 seconds to 200 seconds to allow the cluster more time to become ready before running tests in install-and-execute-testkube-tests.sh.

[suyadav1]

/azp run

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[github-actions]

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