[EventHubs] Add push mode samples to timed samples section

[swathipil]

To be completed after issue: #16617

Summary

Many EH samples run forever because of push mode. Currently, we choose to ignore these samples when testing in the live test pipeline. This is done by listing the samples in the IGNORED_SAMPLES of scripts/devops_tasks/test_run_samples.py. We want to allow these samples to exit() after a time limit.

Scope of work

Add the following push-mode samples to the TIMED_SAMPLES section in scripts/devops_tasks/test_run_samples.py. Since this issue should be completed after #16617 , the TIMED_SAMPLES section should already be in place.

Success Criteria

• Add EH push-mode samples to the TIMED_SAMPLES section.
• Remove these samples from the IGNORED_SAMPLES section

[swathipil]

all push-mode samples:

SYNC
        "authenticate_with_sas_token.py",
        "connection_to_custom_endpoint_address.py",
        "proxy.py",
        "receive_batch_with_checkpoint.py",
        "recv.py",
        "recv_track_last_enqueued_event_prop.py",
        "recv_with_checkpoint_by_event_count.py",
        "recv_with_checkpoint_by_time_interval.py",
        "recv_with_checkpoint_store.py",
        "recv_with_custom_starting_position.py",
        "sample_code_eventhub.py",
        # checkpointstoreblob samples
        "receive_events_using_checkpoint_store.py",
        "receive_events_using_checkpoint_store_storage_api_version.py"

ASYNC
        "authenticate_with_sas_token_async.py",
        "connection_to_custom_endpoint_address_async.py",
        "iot_hub_connection_string_receive_async.py",
        "proxy_async.py",
        "receive_batch_with_checkpoint_async.py",
        "recv_async.py",
        "recv_track_last_enqueued_event_prop_async.py",
        "recv_with_checkpoint_by_event_count_async.py",
        "recv_with_checkpoint_by_time_interval_async.py",
        "recv_with_checkpoint_store_async.py",
        "recv_with_custom_starting_position_async.py",
        "sample_code_eventhub_async.py".
        # checkpointstoreblobaio samples
        "receive_events_using_checkpoint_store_async.py",
        "receive_events_using_checkpoint_store_storage_api_version_async.py"

[swathipil]

as per @yunhaoling 's comments in #17139, update : "authenticate_with_sas_token(_async), we could change to use send as sample"