Misc fixes for 1.11 release

[skkosuri-amzn]

Issue #, if available:
Misc fixes.
Description of changes:

1. Delete dead code,
2. Fixed flaky tests.
3. Reverted to runBlocking for monitor runner.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #274 into master will decrease coverage by 0.50%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #274      +/-   ##
============================================
- Coverage     80.22%   79.71%   -0.51%     
+ Complexity      196      192       -4     
============================================
  Files           150      150              
  Lines          5132     5132              
  Branches        661      661              
============================================
- Hits           4117     4091      -26     
- Misses          655      680      +25     
- Partials        360      361       +1     

Impacted Files	Coverage Δ	Complexity Δ
...rch/alerting/transport/TransportGetAlertsAction.kt	72.60% <ø> (ø)	0.00 <0.00> (ø)
...endistroforelasticsearch/alerting/MonitorRunner.kt	76.31% <100.00%> (-0.44%)	0.00 <0.00> (ø)
...arch/alerting/core/schedule/JobSchedulerMetrics.kt	62.50% <0.00%> (-18.75%)	4.00% <0.00%> (-2.00%)
...rch/alerting/core/action/node/ScheduledJobStats.kt	55.55% <0.00%> (-11.12%)	3.00% <0.00%> (-1.00%)
...roforelasticsearch/alerting/alerts/AlertIndices.kt	66.14% <0.00%> (-9.45%)	0.00% <0.00%> (ø%)
...ing/destination/client/DestinationEmailClient.java	72.50% <0.00%> (-5.00%)	7.00% <0.00%> (-1.00%)
...asticsearch/alerting/core/schedule/JobScheduler.kt	71.42% <0.00%> (-4.29%)	15.00% <0.00%> (ø%)
...distroforelasticsearch/alerting/core/JobSweeper.kt	71.65% <0.00%> (-0.54%)	35.00% <0.00%> (ø%)
...ing/model/destination/DestinationContextFactory.kt	66.66% <0.00%> (ø)	0.00% <0.00%> (ø%)
... and 1 more

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