Fix/example advanced k8s

[Zvikan]

What does this PR do?

• replacing hard coded region to data source value
• disabling k8s-advanced and observability from e2e matrix list
  • k8s-advanced required variables to be passed (e.g. VPC id), these use cases needs to be addressed for the parallel e2e scope
  • observability TF plan time takes way longer than expected, disabling from e2e until example fixed.

Motivation

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Yes, I have added a new example under examples to support my PR
• Yes, I have created another PR for add-ons under add-ons repo (if applicable)
• Yes, I have updated the docs for this feature
• Yes, I ran pre-commit run -a with this PR

Note: Not all the PRs required examples and docs except a new pattern or add-on added.

For Moderators

• E2E Test successfully complete before merge?

Additional Notes