Continue to evaulate / migrate after failures

[peternied]

Description

Updates the behavior of the metadata processing for templates and indexes to collect all the results and then return failure details after all items have been processed. When items are not created they will appear in the output with a reason and exception if needed be. Here is the output from an updated evaulate test case where the index already_exists was already on the target cluster and won't be created.

Clusters:
   Source:
      Remote Cluster: ELASTICSEARCH 6.8.23 ConnectionContext(uri=http://localhost:36188, protocol=HTTP, insecure=false, compressionSupported=false)

   Target:
      Remote Cluster: OPENSEARCH 2.14.0 ConnectionContext(uri=http://localhost:36187, protocol=HTTP, insecure=false, compressionSupported=false)


Migration Candidates:
   Index Templates:
      simple_index_template

   Component Templates:
      <NONE FOUND>

   Indexes:
      blog_2023, movies_2023
      WARN - already_exists already exists

   Aliases:
      alias1, movies-alias


Results:
   0 issue(s) detected

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Attention: Patch coverage is 76.62338% with 36 lines in your changes missing coverage. Please review.

Project coverage is 80.17%. Comparing base (baa7bc2) to head (c0e242d).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...version_os_2_11/GlobalMetadataCreator_OS_2_11.java	20.00%	10 Missing and 2 partials ⚠️
...opensearch/migrations/metadata/CreationResult.java	65.00%	7 Missing ⚠️
...search/migrations/bulkload/worker/IndexRunner.java	64.70%	6 Missing ⚠️
...rch/migrations/commands/MigratorEvaluatorBase.java	50.00%	4 Missing and 1 partial ⚠️
...oad/transformers/IndexTransformationException.java	0.00%	2 Missing ⚠️
...grations/bulkload/worker/IndexMetadataResults.java	0.00%	0 Missing and 2 partials ⚠️
...main/java/org/opensearch/migrations/cli/Items.java	97.91%	1 Missing ⚠️
...bulkload/version_os_2_11/IndexCreator_OS_2_11.java	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1037      +/-   ##
============================================
- Coverage     80.54%   80.17%   -0.38%     
- Complexity     2736     2745       +9     
============================================
  Files           365      367       +2     
  Lines         13614    13743     +129     
  Branches        941      949       +8     
============================================
+ Hits          10966    11018      +52     
- Misses         2068     2149      +81     
+ Partials        580      576       -4     

Flag	Coverage Δ
gradle-test	78.08% <76.62%> (-0.51%)	⬇️
python-test	90.24% <ø> (+0.13%)	⬆️

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[AndreKurait]

Thanks for the cleanup, i'm good for merging once the isolatedTests are fixed