Fixes an issue with search cards for harvested records

[landreev]

What this PR does / why we need it:

See the issue, fairly straightforward

This implements indexing of the actual origin of harvested records as the "metadata source" as an optional feature - i.e., one needs to opt in to have it indexed; otherwise the old-style "Harvested" will be indexed for all harvested objects.

Which issue(s) this PR closes:

Closes #10611

Special notes for your reviewer:

Suggestions on how to test this:

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

Additional documentation:

[coveralls]

coverage: 20.658%. remained the same
when pulling ee986d5 on 10611-harvested-datasets-display
into 9c098f9 on develop.

[landreev]

I think it's ready, just needs an updated release note reflecting the new setting for the feature.
The Jenkins run yesterday appears to have died because of an aws fluke/timeout. My commit has just started another run, we'll see how it goes.

[coveralls]

coverage: 20.658%. remained the same
when pulling 9f504e2 on 10611-harvested-datasets-display
into 9c098f9 on develop.

[coveralls]

coverage: 20.659% (+0.001%) from 20.658%
when pulling bb79449 on 10611-harvested-datasets-display
into 9c098f9 on develop.

[landreev]

(the 2 harvesting clients Jenkins tests are failing now, since they are relying on the "metadata source" feature - we'll add the flag to the harvesting config in jenkins.yml once the PR is merged)

[qqmyers]

Looks good.

[landreev]

@donsizemore has merged /gdcc/dataverse-ansible/pull/363 (thank you!), so I'm re-running the tests.

[landreev]

There were a couple of simple merge conflicts with #10579 (that's why the last Jenkins test refused to run); resolved.

[coveralls]

coverage: 20.637%. remained the same
when pulling c37b0f4 on 10611-harvested-datasets-display
into 94b15e2 on develop.

[coveralls]

coverage: 20.637%. remained the same
when pulling c37b0f4 on 10611-harvested-datasets-display
into 94b15e2 on develop.

[github-actions]

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[landreev]

Tests are passing now.