refactor: Only allow one instance of ShipwrightBuild

[kevydotvinu]

Changes

• Ignore and delete the second instance

Fixes #153

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• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
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Release Notes

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[jkhelil]

Thank you @kevydotvinu for adding your contribution.
A few points related to your PR:

• first it is valid point to ensure that we have once instance of shipwright-build CR
• we need to have an approach where we fix the name of the CR,and validate that name before any reonciliation (shipwright-config)
• we would then include a targetNamespace reconcile function, that deletes the old resources if the target namespace changes
• The change needs a release note and docs update

[openshift-merge-robot]

PR needs rebase.

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[kevydotvinu]

Hello @jkhelil, thanks for reviewing. Sure, I will add those changes.

[adambkaplan]

@kevydotvinu please let us know if you have the time to work on this PR further. We plan on doing a significant refactor soon which will make this pull request very obsolete and hard to rebase.

[sayan-biswas]

IMO, using webhook is a better user experience for this use case.

[kevydotvinu]

I will work on it.