Read default build bundle from APIExport workspace

[mmorhun]

Signed-off-by: Mykola Morhun mmorhun@redhat.com

What does this PR do?:

Changes default build bundle configuration way.
With this changes the following order is used:

1. build-pipelines-defaults ConfigMap in the Component namespace
2. build-pipelines-defaults ConfigMap in the build-templates namespace
3. Fallback bundle (hardcoded)

Which issue(s)/story(ies) does this PR fixes:

https://issues.redhat.com/browse/PLNSRVCE-782

How to test changes / Special notes to the reviewer:

1. Deploy AppStudio into KCP cluster
2. Go to redhat-appstudio KCP-workspace, create build-templates namespace and create there ConfigMap named build-pipelines-defaults with default_build_bundle key and bundle as value.
3. Go to appstudio KCP-workspace, create an Application and a Component.
4. Check for a new build Pipeline and for the bundle used. It must be the bundle from the ConfigMap.

Depends on

redhat-appstudio/application-service#202

[gabemontero]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gabemontero, Michkov, mmorhun

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