[release-1.7] Pin the default RHDH image to 1.7 [RHIDP-9361]

[rm3l]

Description

This is to prevent future issues, like if the next tag introduces breaking changes for the tests in this release branch.
Note that specific 1.x tags will be used by default only on the release-1.x branches. main can continue to use the next RHDH tag by default.

Which issue(s) does this PR fix or relate to

Relates to https://issues.redhat.com/browse/RHIDP-9361

How to test changes / Special notes to the reviewer

Checklist

• For each Chart updated, version bumped in the corresponding Chart.yaml according to Semantic Versioning.
• For each Chart updated, variables are documented in the values.yaml and added to the corresponding README.md. The pre-commit utility can be used to generate the necessary content. Use pre-commit run -a to apply changes. The pre-commit Workflow will do this automatically for you if needed.
• JSON Schema template updated and re-generated the raw schema via the pre-commit hook.
• Tests pass using the Chart Testing tool and the ct lint command.
• If you updated the orchestrator-infra chart, make sure the versions of the Knative CRDs are aligned with the versions of the CRDs installed by the OpenShift Serverless operators declared in the values.yaml file. See Installing Knative Eventing and Knative Serving CRDs for more details.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud