fix(ui): Adding chart's last modified data on search index

[sakethvarma397]

Currently the chart's last modified date is not exposed on search index making it not discoverable by 'Last Modified (in source)' filter on Search Page. Making the field searchable will add that capability.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
8499	1	8498	70

View the top 1 failed test(s) by shortest run time

tests.integration.druid.test_druid::test_druid_ingest

Stack Traces | 137s run time

docker_compose_runner = <function docker_compose_runner.<locals>.run at 0x7f283a564400>

    @pytest.fixture(scope="module")
    def druid_up(docker_compose_runner):
        with docker_compose_runner(
            DOCKER_DIR / "docker-compose.yml", "druid"
        ) as docker_services:
>           wait_for_port(docker_services, "coordinator", 8081, timeout=120)

.../integration/druid/test_druid.py:23: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.../datahub/testing/docker_utils.py:36: in wait_for_port
    docker_services.wait_until_responsive(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = Services(_docker_compose=DockerComposeExecutor(_compose_command='docker compose --parallel -1', _compose_files=[PosixP....../druid/docker/docker-compose.yml')], _compose_project_name='pytest6431-druid'), _services={})
check = <function wait_for_port.<locals>.<lambda> at 0x7f283a564360>
timeout = 120, pause = 0.5, clock = <built-in function perf_counter>

    def wait_until_responsive(
        self,
        check: Any,
        timeout: float,
        pause: float,
        clock: Any = timeit.default_timer,
    ) -> None:
        """Wait until a service is responsive."""
    
        ref = clock()
        now = ref
        while (now - ref) < timeout:
            if check():
                return
            time.sleep(pause)
            now = clock()
    
>       raise Exception("Timeout reached while waiting on service!")
E       Exception: Timeout reached while waiting on service!

venv/lib/python3.11.../site-packages/pytest_docker/plugin.py:119: Exception

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