add stac-server enable_ingest_action_truncate configuration

[philvarner]

Related issue(s)

• add behavior to allow for deleting items out of collections in bulk stac-utils/stac-server#891

Proposed Changes

1. add configuration for enable_ingest_action_truncate env var
2. changed the default of the variable definition of the collection_authn to be false instead of true. All of the uses of this already correctly defaulted to false, so this doesn't change the actual behavior.

Testing

This change was validated by the following observations:

1. n/a will validate on project deploy

Checklist

• I have deployed and validated this change
• Changelog
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  • No changelog entry is necessary
• README migration
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[philvarner]

Thanks @cvangerpen -- could you also merge? I don't have permissions to do that. Thanks!

[cvangerpen]

No, I can't override the non-organization-member snyk error that's preventing scanning :/

[philvarner]

I guess it's up to @hectormachin :/