Add support for running the reindex job across resources in multiple partitions and all partitions

[codeforgreen]

6008

What was done:

• added a new bean with interface IJobPartitionProvider which can return a list of partitions for operation requests. The implementation will handle requests configured with RequestPartitionId.allPartitions and return a list of all partitions, including the default partition. Please mind that this interface is likely to change as another factor for determining partitions to run a job against can also be a list of urls provided as parameters in these jobs. Further simplification can be made and I plan to add another PR just for that refactoring simplification (bring UrlPartitioner into the mix as it also computes partitions for jobs).
• updated ReindexProvider to use the new bean to compute the partitions
• made a few simplifications in the existing batch2 jobs since most of them required partitioning support so some json model classes (extending IModelJson) were merged and made some of the templating across job steps simpler. I removed the "partitioned" prefix out of the classes since there was no use-case not requiring partitions and it seemed right. For example, RequestDetails did not get extended when partitioning was added.
• updated the batch2 framework such that passing a list of partitions can be understood by jobs based on GenerateRangeChunksStep and JobPartitions. Also made updates such that the chunk partitionId is the authoritative source for partition information to handle the next steps for the chunk.
• introduced another loop in the GenerateRangeChunksStep such that can have cartesian product (urls x partitions) for generating chunks provided in the job parameters.
• updated the documentation; may make a few more changes to explain the _ALL tenant.
• added tests for the batch2 steps that were changed and for the reindex job

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.43%. Comparing base (497b9f2) to head (125c04f). Report is 120 commits behind head on master.

:exclamation: Current head 125c04f differs from pull request most recent head 650f35c

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #6009 +/- ## ============================================ + Coverage 83.39% 83.43% +0.03% - Complexity 26927 27230 +303 ============================================ Files 1681 1695 +14 Lines 103965 105329 +1364 Branches 13189 13317 +128 ============================================ + Hits 86702 87881 +1179 - Misses 11613 11743 +130 - Partials 5650 5705 +55 ```

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