oci-helmrepo: handle conditions summary in-line

Refactor the OCI HelmRepo reconciler to remove extra custom status
conditions and manage Ready, Reconciling and Stalled conditions within
the reconciler, in-line.
The internal/reconcile/summarize package uses the patch helper
conditions summary before patching which results in overwriting the
Ready condition with Reconciling condition as it's a negative polarity
condition.
For OCI HelmRepository, since it's a simple reconciler, it'd be better
to not introduce extra conditions and utilize the three base conditions
to represent the status. In order to have the same consistent status
conditions, a new summarization is written within the reconciler based
on the context. It takes into consideration a lot of the details from
the internal/reconcile/summarize package and handles certain scenarios
in context specific ways. All the result and error abstractions are
removed since they are only needed when using internal/reconcile
package.

Signed-off-by: Sunny <[email protected]>

Author: darkowlzz