feat: Added namespace support for virtualService and destinationRule

[kiranyadv]

Description

Fixes #6869

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR requires documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested it for all user roles.
• I have added all the required unit/api test cases.

Does this PR introduce a user-facing change?

Summary by Bito

• This pull request introduces improvements to the Istio configuration templates by adding support for specifying namespaces in both the destination rule and virtual service YAML files.
• The changes ensure that the namespace can be dynamically set based on the provided values, improving the flexibility of the deployment.
• This enhancement allows for better resource management and organization within Kubernetes environments.
• Overall, the changes touch on Istio configuration templates, specifically enhancing namespace support, which introduces flexibility in deployment.

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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

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