Added unit and integration test cases

[atttiwari]

Description of change

PR Include newly added unit test cases and integration test cases.
SAC-29908

Manual QA steps

• Discovery: Running
• Sync: Running
• Unit Tests: Running
• Integration test: Running

Risks

• Tests can validate incorrect behavior.

Rollback steps

• revert this branch

AI generated code

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• this PR has been written with the help of GitHub Copilot or another generative AI tool

[Copilot]

Pull request overview

This PR adds comprehensive test coverage for the MS Teams tap by introducing unit tests and integration tests. The changes enable validation of sync functionality, incremental replication, client behavior, and standard tap-tester integration tests.

Key Changes:

• Added unit tests for sync operations, incremental streams, and client functionality
• Added integration tests following tap-tester patterns (discovery, bookmarks, pagination, etc.)
• Uncommented CircleCI configuration to enable test execution in CI/CD pipeline

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unittests/test_sync.py	Unit tests for sync operations including full table and incremental sync scenarios
tests/unittests/test_incremental_sync.py	Unit tests for incremental stream behavior, bookmark management, and date handling
tests/unittests/test_client.py	Unit tests for Microsoft Graph API client operations including authentication and error handling
tests/test_start_date.py	Integration test for start date functionality
tests/test_pagination.py	Integration test for pagination handling
tests/test_interrupted_sync.py	Integration test for interrupted sync recovery
tests/test_discovery.py	Integration test for discovery mode
tests/test_bookmark.py	Integration test for bookmark handling
tests/test_automatic_fields.py	Integration test for automatic field selection
tests/test_all_fields.py	Integration test for all fields replication
tests/base.py	Base test class with stream metadata and configuration
.circleci/config.yml	Enabled unit and integration test execution in CI pipeline

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[prijendev]

Build is failing. Please fix it

[atttiwari]

Build is failing due to code checkout issue in circle-ci.
https://app.circleci.com/pipelines/github/singer-io/tap-ms-teams/1438/workflows/e1656dac-22fe-4d6e-8843-e472160456cb/jobs/1438