[Console API] Add basic get status API

[lewijacn]

Description

This change introduces a simple get status API to our Console API for retrieving the status of an OSI migration. This logic currently only returns the status and statusMessage from the OSI getPipeline API with the anticipation to add more details like progress in future iterations.

Also included is some reformatting of the response given by each of the API endpoints to keep a consistent response structure on error.

Issues Resolved

https://opensearch.atlassian.net/browse/MIGRATIONS-1945

Testing

Unit testing and manual cloud testing

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 83.56164% with 12 lines in your changes missing coverage. Please review.

Project coverage is 74.54%. Comparing base (335fce8) to head (397a898).
Report is 96 commits behind head on main.

Files with missing lines	Patch %	Lines
...console_api/console_api/apps/orchestrator/views.py	67.56%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #903      +/-   ##
============================================
- Coverage     74.93%   74.54%   -0.40%     
- Complexity     1933     1961      +28     
============================================
  Files           334      343       +9     
  Lines         13387    13607     +220     
  Branches        773      786      +13     
============================================
+ Hits          10032    10143     +111     
- Misses         2870     2977     +107     
- Partials        485      487       +2     

Flag	Coverage Δ
gradle-test	68.99% <ø> (-0.50%)	⬇️
python-test	88.60% <100.00%> (+0.01%)	⬆️

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[sumobrian]

lgtm