Add a resource google_discovery_engine_recommendation_engine

[jialei-chen]

Fixes hashicorp/terraform-provider-google#18806

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

`google_discovery_engine_recommendation_engine`

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

Googlers: For automatic test runs see go/terraform-auto-test-runs.

@rileykarson, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 6 files changed, 1573 insertions(+), 2 deletions(-))
google-beta provider: Diff ( 6 files changed, 1573 insertions(+), 2 deletions(-))
terraform-google-conversion: Diff ( 1 file changed, 297 insertions(+))
Open in Cloud Shell: Diff ( 8 files changed, 252 insertions(+))

Missing test report

Your PR includes resource fields which are not covered by any test.

Resource: google_discovery_engine_recommendation_engine (4 total tests)
Please add an acceptance test which includes these fields. The test should include the following:

resource "google_discovery_engine_recommendation_engine" "primary" {
  media_recommendation_engine_config {
    engine_features_config {
      most_popular_config {
        time_window_days = # value needed
      }
    }
    optimization_objective_config {
      target_field             = # value needed
      target_field_value_float = # value needed
    }
  }
}

[modular-magician]

Tests analytics

Total tests: 20
Passed tests: 17
Skipped tests: 0
Affected tests: 3

Click here to see the affected service packages

• discoveryengine

#### Action taken

Found 3 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

• TestAccDiscoveryEngineRecommendationEngine_discoveryengineRecommendationengineGenericExample
• TestAccDiscoveryEngineRecommendationEngine_discoveryengineRecommendationengineMediaExample
• TestAccDiscoveryEngineRecommendationEngine_discoveryengineRecommendationengineMediaExample_update

Get to know how VCR tests work

[modular-magician]

🟢 Tests passed during RECORDING mode:
TestAccDiscoveryEngineRecommendationEngine_discoveryengineRecommendationengineGenericExample [Debug log]
TestAccDiscoveryEngineRecommendationEngine_discoveryengineRecommendationengineMediaExample [Debug log]
TestAccDiscoveryEngineRecommendationEngine_discoveryengineRecommendationengineMediaExample_update [Debug log]

🟢 No issues found for passed tests after REPLAYING rerun.

---

🟢 All tests passed!

View the build log or the debug log for each test

[github-actions]

@rileykarson This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.