Add runtimeClassName field to Build and BuildRun APIs

[IrvingMg]

Changes

This PR adds support for runtimeClassName field in Build and BuildRun APIs, allowing builds to run with alternative container runtimes.

Fixes #2074

/kind feature

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

You can now specify a `runtimeClassName` on a Build and BuildRun to use alternative container runtimes.

[SaschaSchwarze0]

/approve
/lgtm

[openshift-ci]

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