feat: added new standard variation for stack

[toddgiguere]

Description

Added new variation "standard" for stack, including a compute option of ROKS (instead of CodeEngine) and a platinum version of Elasticsearch.

Also updated version of Elasticsearch DA in both basic and standard.

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[toddgiguere]

/run pipeline

[toddgiguere]

/run pipeline

[toddgiguere]

/run pipeline

[toddgiguere]

/run pipeline

[toddgiguere]

Both "basic" and "standard" tests have passed, but the ExistingResources tests seems to be stuck in the undeploy stages:

=== NAME  TestProjectsBasicExistingResourcesTest
    tests.go:641: [PROJECTS] Configuration Essential Security - Observability Event Notifications is still undeploying

This just repeats.

[ocofaigh]

@toddgiguere that usually means its a projects config sync issue. The undeploy might of actually completed in schematics, but the project config is out of sync. Running the ibmcloud project config-sync is the current workaround from projects team. If the config and workspace still exist, you could confirm that

[terraform-ibm-modules-ops]

🎉 This PR is included in version 0.4.0 🎉

The release is available on:

• GitHub release
• v0.4.0

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