fix: Feed Search endpoint is returning DB id instead of feed.stable_id for feed_references field

[davidgamez]

Summary:

Update the FeedSearch view by replacing the internal feed ID with the stable feed ID.

Closes #389

Expected behavior:

The feed_references field is populated with stable ids. Find a snipped of a local response below,

        {
            "id": "mdb-1628",
            "data_type": "gtfs_rt",
            "status": "active",
............

            "feed_references": [
                "mdb-510"
            ]
        },

Testing tips:

• Checkout the branch
• Execute(**Warning your local database content will be deleted),

./scripts/docker-localdb-rebuild-data.sh --populate-db

• Execute,

./scripts/api-start.sh

• Test the search endpoints filtering by gtfs_rt feeds. Example curl command,

curl --location 'http://localhost:8080/v1/search?search_query=New%20York&offset=10&limit=5&status=active&data_type=gtfs_rt' \
--header 'Accept: application/json'

• Verify that stable IDs in the form mdb-## are present in the feed_references arrays.

Please make sure these boxes are checked before submitting your pull request - thanks!

• Run the unit tests with ./scripts/api-tests.sh to make sure you didn't break anything
• Add or update any needed documentation to the repo
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

[davidgamez]

This is the portion of the view that I modified. cc: @Alessandro100

[Alessandro100]

LGTM ✅