fix: sqlite query config escaping

[lampajr]

Fixes https://issues.redhat.com/browse/RHOAIENG-3496

Description

Fixes an issue introduced with the string escaping:

I experienced he following issue by starting the mlmd server (image quay.io/opendatahub/mlmd-grpc-server:main-ec2c7b1) together with sqlite configuration.

ARNING: Logging before InitGoogleLogging() is written to STDERR                                                                                                                          [15:31:43]
F0221 14:31:43.422607     1 metadata_store_server_main.cc:611] Check failed: absl::OkStatus() == status (OK vs. INTERNAL: Error when executing query: no such column: mlmd.Dataset query:  SELECT `id`, `name`, `version`, `description`,         `input_type`, `output_type` FROM `Type`  WHERE name IN (mlmd.Dataset, mlmd.Model, mlmd.Metrics, mlmd.Statistics) AND version IS NULL AND type_kind = 1; ) MetadataStore cannot be created with the given connection config.
*** Check failure stack trace: ***

The sqlite config I used is the same used in model registry: https://github.com/opendatahub-io/model-registry/blob/main/test/config/ml-metadata/conn_config.pb for testing purposes.

Since I am not expert on the codebase I don't know if this fix is going to revert the issue fixed with #2

How Has This Been Tested?

Build local image and run model registry test using the sqlite configuration.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[isinyaaa]

Hi, Andrea, thanks for fixing that, it had not occurred to me to test it using sqlite.

Since I am not expert on the codebase I don't know if this fix is going to revert the issue fixed with #2

I'm afraid it actually does, now, I think the fix is exactly as you did, but you should instead apply the quotes around SqliteMetadataSource::EscapeString on ml_metadata/metadata_store/sqlite_metadata_source.cc.

[lampajr]

@isinyaaa I tried locally and the sqlite configs looks working, model-registry tests are working using image built from this branch