[YUNIKORN-2972] Remove internal object from user and group REST info

[wilfred-s]

What is this PR for?

Remove the Resource object from the REST response for the user and group trackers. Removed the usage of the DAO objects in the internal unit tests. The unit tests use new functions which directly expose the same structures without using the DAO.

Cleanup:

• remove export from internal functions (UserTracker, GroupTracker)
• renamed functions to match their results (Manager)
• update handler to call renamed functions in Manager
• reimplemented test functions to not use DAO objects (Manager, UserTracker, GroupTracker, QueueTracker)
• assert function changes to use new functions removing DAO usage (scheduler/utilites_test, scheduler/objects/utilites_test)

What type of PR is it?

• - Bug Fix
• - Improvement
• - Refactoring

What is the Jira issue?

• YUNIKORN-2972

How should this be tested?

Existing unit test cover the code

NOTE: this will break e2e test, the user_group_limit_test uses the DAO directly

Questions:

• - There is breaking changes for older versions.
• - It needs documentation.

[codecov]

Codecov Report

Attention: Patch coverage is 49.61832% with 66 lines in your changes missing coverage. Please review.

Project coverage is 81.31%. Comparing base (6ef347b) to head (7bd48c9).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/scheduler/ugm/queue_tracker.go	58.49%	21 Missing and 1 partial ⚠️
pkg/scheduler/ugm/group_tracker.go	38.46%	16 Missing ⚠️
pkg/scheduler/ugm/user_tracker.go	38.46%	16 Missing ⚠️
pkg/scheduler/ugm/manager.go	50.00%	8 Missing ⚠️
pkg/webservice/handlers.go	60.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #993      +/-   ##
==========================================
- Coverage   81.50%   81.31%   -0.19%     
==========================================
  Files          97       97              
  Lines       15520    15587      +67     
==========================================
+ Hits        12649    12675      +26     
- Misses       2592     2632      +40     
- Partials      279      280       +1     

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[craigcondit]

+1 LGTM.