Update tree operator from symbols to strings

[tongyu-microsoft]

This PR updates tree operators from symbols to strings.

Description

This is a follow up PR for https://github.com/microsoft/responsible-ai-toolbox/pull/1525 Use of "==" and "!=" confusing to non-programmers, update operators to strings.

Feedback from a customer meeting: When the dashboard was using '!=' they didn't appreciate that this meant "Not Equal" - similarly "==" didn't mean anything to them. We should probably use more widely understood operators.

Acceptance criteria: Age == 41: Age equal to 41 Age != 41: Age not equal to 41 Age < 41: Age less than 41 Age > 41: Age greater than 41

Before:

After:

Checklist

• [x] I have added screenshots above for all UI changes.
• [ ] I have added e2e tests for all UI changes.
• [ ] Documentation was updated if it was needed.

[codecov-commenter]

Codecov Report

Merging #1528 (09aeacf) into main (9c66830) will decrease coverage by 6.89%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1528      +/-   ##
==========================================
- Coverage   87.27%   80.37%   -6.90%     
==========================================
  Files         108       41      -67     
  Lines        5108     1687    -3421     
==========================================
- Hits         4458     1356    -3102     
+ Misses        650      331     -319     

Flag	Coverage Δ
unittests	80.37% <ø> (-6.90%)	:arrow_down:

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Impacted Files	Coverage Δ
...ranalysis/erroranalysis/_internal/cohort_filter.py
...is/erroranalysis/_internal/surrogate_error_tree.py
...i/responsibleai/managers/counterfactual_manager.py
...ibleai/_tools/shared/state_directory_management.py
.../responsibleai/_managers/counterfactual_manager.py
...ponsibleai/databalanceanalysis/balance_measures.py
erroranalysis/erroranalysis/_internal/metrics.py
.../responsibleai/_managers/error_analysis_manager.py
...ai/databalanceanalysis/feature_balance_measures.py
responsibleai/responsibleai/_data_validations.py
... and 57 more

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[github-actions[bot]]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/tongy/updateTreeOperator/dashboard/index.html

[github-actions[bot]]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/tongy/updateTreeOperator/dashboard/index.html

[gaugup]

Are there other places in the code where this needs to be changed? What about cohort conditions? example "age > 20"