SUMO-115364 Handle exceptions thrwon from kubeclient calls

[yuting-liu]

Since we are using timer_execute for start_monitor, any exceptions thrown from the method will cause the timer detached.

We are going to add exceptions handling for all methods that have kubeclient calls in events plugin, including following methods:

start_watcher_thread
create_config_map
patch_config_map
initialize_resource_version
pull_resource_version

We will only rescue possible errors and then log the error so that we can know errors from which method they throw. For all other methods except for start_watch_thread, we don't want errors from kubeclient blocks the thread of watching, so we just log the error and ignore it. For start_watcher_thread, we need timer_execute continues working so exceptions will be swallowed and timer won't be detached in this case.

[maimaisie]

LGTM with some comments in the unit tests

[samjsong]

LGTM pending Maisie's comments

[yuting-liu]

Refactored the part of creating the test driver with configuration and instance variable setup into a method configure_test_driver(config = %([])).

[maimaisie]

LGTM