Add missing flow field to Camel source CRD validation

[astefanutti]

Fixes #566

Proposed Changes

Add the flow field to the Camel source CRD validation section.

/cc @nicolaferraro

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[knative-prow-robot]

Hi @astefanutti. Thanks for your PR.

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[astefanutti]

@googlebot I signed it!

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[n3wscott]

/ok-to-test
/approve

Someone who works with Camel should lgtm, thanks!

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: astefanutti, n3wscott

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[nicolaferraro]

LGTM

[n3wscott]

/lgtm

Thanks @nicolaferraro