K8SPG-647: remove major-upgrade from release tests

[eleo007]

CHANGE DESCRIPTION

Problem:
The major upgrade is a tech preview feature and the test is constantly fails due to https://perconadev.atlassian.net/browse/K8SPG-647 . It was decided to remove the test till the issue is fixed or new major upgrade is added in https://perconadev.atlassian.net/browse/K8SPG-784 .

Cause:
Short explanation of the root cause of the issue if applicable.

Solution:
Remove test from release runs.

CHECKLIST

Jira

• Is the Jira ticket created and referenced properly?
• Does the Jira ticket have the proper statuses for documentation (Needs Doc) and QA (Needs QA)?
• Does the Jira ticket link to the proper milestone (Fix Version field)?

Tests

• Is an E2E test/test case added for the new feature/change?
• Are unit tests added where appropriate?

Config/Logging/Testability

• Are all needed new/changed options added to default YAML files?
• Are all needed new/changed options added to the Helm Chart?
• Did we add proper logging messages for operator actions?
• Did we ensure compatibility with the previous version or cluster upgrade process?
• Does the change support oldest and newest supported PG version?
• Does the change support oldest and newest supported Kubernetes version?