r/aws_opensearchserverless_collection: return error on read

[johnsonaj]

Description

Fix crash on import when Read() returns an error.

Relations

Closes #33666

References

Output from Acceptance Testing

$ make testacc TESTARGS='-run=TestAccOpenSearchServerlessCollection_' PKG=opensearchserverless

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/opensearchserverless/... -v -count 1 -parallel 20  -run=TestAccOpenSearchServerlessCollection_ -timeout 360m
--- PASS: TestAccOpenSearchServerlessCollection_disappears (450.91s)
--- PASS: TestAccOpenSearchServerlessCollection_basic (471.98s)
--- PASS: TestAccOpenSearchServerlessCollection_update (483.57s)
--- PASS: TestAccOpenSearchServerlessCollection_tags (515.02s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/opensearchserverless	518.199s

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