[SPARK-53593][SDP] Fix: Use unquoted for response fields

[cookiedough77]

What changes were proposed in this pull request?

This PR fixes the bug where quoted names were being set in the proto response fields for catalog, database, and identifier.

Changes include:

• Removing the use of quoteIdentifier when populating resolvedCatalog, resolvedDb, and resolvedId in the proto response.
• Updating the code to return the raw catalog, database, and identifier values from CatalystIdentifier instead.
• Adjusting unit tests in SparkDeclarativePipelinesServerSuite to validate that proto fields contain unquoted strings, even when names contain special characters like backticks.

Why are the changes needed?

Quoted names are only required when constructing fully qualified string identifiers (e.g., cat.db.table). Proto messages keep catalog, database, and identifier as separate fields and should store the raw values. Returning quoted names in proto fields was a bug and could cause inconsistencies in client usage.

Does this PR introduce any user-facing change?

Yes. The proto responses for dataset and flow definitions will now return raw catalog, database, and identifier values instead of quoted versions. For example, a catalog named ab will be returned as a\bin the proto field, not ``ab .

How was this patch tested?

Updated SparkDeclarativePipelinesServerSuite to verify that proto fields contain raw, unquoted names.

Was this patch authored or co-authored using generative AI tooling?

No.

[sryza]

LGTM!