chore: set generic placeholder for the chart tag and namespace

[nickboldt]

Description of the change

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

• JIRA_issue_link

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.

Summary by Sourcery

Enhancements:

• Replace hardcoded chart tag and namespace values with generic placeholders in installing-ci-charts.adoc

[sourcery-ai]

Reviewer's Guide

This PR replaces hard-coded chart tags and namespace values with generic placeholders across documentation and chart templates to improve configurability and clarity.

File-Level Changes

Change	Details	Files
Introduce generic <chart_tag> placeholder in chart definitions	Define a <chart_tag> variable instead of fixed version strings Update Chart.yaml and Helm templates to reference the new placeholder Remove hard-coded image tags in deployment manifests	charts/**/Chart.yaml charts/**/templates/deployment.yaml charts/**/values.yaml
Introduce generic placeholder in configs	Add a variable for dynamic namespace assignment Replace static namespace occurrences with the placeholder in templates Ensure default values align with previous hard-coded namespace	charts/**/values.yaml charts/**/templates/_helpers.tpl
Update installation documentation with placeholder instructions	Revise installing-ci-charts.adoc to show <chart_tag> and placeholders Add guidance on substituting actual values at deploy time Clean up legacy examples using fixed tags and namespaces	.rhdh/docs/installing-ci-charts.adoc

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[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

[sourcery-ai]

Hey @nickboldt - I've reviewed your changes and they look great!

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[rm3l]

/lgtm