Repos API/Helm - Analyze and migrate the former SyncJobTemplate options to the API

[antgamdia]

Summary
Some of the options that can be set from the chart inside the syncJobPodTemplate are no longer available via API.
For instance, the proxy options and custom labels/annotations.

Background and rationale
After the new Repos API, the majority of the options under the syncJobPodTemplate weren't migrated. We

Description
For example:

• Add http_proxy, https_proxy and no_proxy to the helm apprepo via API
• Add annotation and labels to the helm apprepo's pods via API

Acceptance criteria

• Get a list of features that are/were available vs the ones supported by the repos API.
• For each one, decide whether to ignore it or accept it.

Additional context
IMHO, this is not urgent as, at least, users can still apply these options via chart.

[antgamdia]

FTR, Greg shared a way to force a repo reconciliation in Flux. It could be useful for adding a manual "sync" button in the UI as we used to have for the Helm direct plugin in the past.

https://fluxcd.io/flux/components/source/ocirepositories/#triggering-a-reconcile