feat(import): adds parameter to ignore non-existing remote resource for import

[mlucic]

The goal of these changes is to provide a way for a user to ignore the "Cannot import non-existent remote object" error. This relates to #33633

The change is to add a new parameter for the import block "ignore_not_exists" which when set to true will result in the "Cannot import non-existent remote object" error being filtered from the the diagnostics and thus allow for the plan to continue.

Fixes #33633

Target Release

1.8.x

Draft CHANGELOG entry

NEW FEATURES

• Adds "ignore_not_exists" (boolean) parameter to the import block to ignore the "Cannot import non-existent remote object" error during import.

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