Update libraries and add tests

[MuralidharT03]

Description of change

Adds a comprehensive Python unittest suite around tap_harvest_forecast behavior (discovery, sync/windowing, bookmarks/state) and updates dependencies/CI to run the tests while also adjusting several JSON schemas to allow nullable arrays/objects.

Jira Ticket: SAC-28723

Changes:

• Add new unit + “integration-style” tests covering discovery output, pagination/windowing, bookmarking, interrupted sync resumption, and start_date filtering.
• Update multiple stream schemas to allow null for fields that are sometimes returned as null (arrays/objects).
• Bump library pins and update CircleCI to run unittest and use Python 3.12.

Manual QA steps

Risks

Rollback steps

• revert this branch

AI generated code

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[Copilot]

Pull request overview

Adds a comprehensive Python unittest suite around tap_harvest_forecast behavior (discovery, sync/windowing, bookmarks/state) and updates dependencies/CI to run the tests while also adjusting several JSON schemas to allow nullable arrays/objects.

Changes:

• Add new unit + “integration-style” tests covering discovery output, pagination/windowing, bookmarking, interrupted sync resumption, and start_date filtering.
• Update multiple stream schemas to allow null for fields that are sometimes returned as null (arrays/objects).
• Bump library pins and update CircleCI to run unittest and use Python 3.12.

Reviewed changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/unittests/test_init.py	New unit tests for core helpers (auth, request, windowing, discover, sync, main).
tests/unittests/__init__.py	Marks tests/unittests as a package for discovery/imports.
tests/base.py	Shared test utilities + mock config/records/catalog creation for integration-style tests.
tests/test_discovery.py	Verifies discover-mode JSON catalog structure and metadata.
tests/test_pagination.py	Verifies windowed sync requests and cross-window behavior.
tests/test_start_date.py	Verifies start_date filtering and initial bookmark behavior.
tests/test_bookmark.py	Verifies bookmark advancement and filtering with existing state.
tests/test_interrupted_sync.py	Verifies resuming from last bookmark and state update cadence.
tests/test_automatic_fields.py	Verifies PK/replication key fields are always present.
tests/test_all_fields.py	Verifies output includes all record fields provided by mock records.
tests/__init__.py	Marks tests as a package for relative imports.
tap_harvest_forecast/schemas/roles.json	Allow person_ids/placeholder_ids to be null or array.
tap_harvest_forecast/schemas/projects.json	Allow tags to be null or array.
tap_harvest_forecast/schemas/placeholders.json	Allow roles to be null or array.
tap_harvest_forecast/schemas/people.json	Allow roles to be null or array; working_days to be null or object.
setup.py	Update pinned dependency versions.
.circleci/config.yml	Switch venv to Python 3.12 and add a step to run the test suite.

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