refactor: DBTP-1643 - Adding exceptions in ConfigValidator

[chiaramapellimt]

Addresses DBTP-1643

---

Checklist:

Title:

• Scope included as per conventional commits
• Ticket reference included (unless it's a quick out of ticket thing)

Description:

• Link to ticket included (unless it's a quick out of ticket thing)
• Includes tests (or an explanation for why it doesn't)
• If the work includes user interface changes, before and after screenshots included in description
• Includes any applicable changes to the documentation in this code base
• Includes link(s) to any applicable changes to the documentation in the DBT Platform Documentation (can be to a pull request)

Tasks:

• Run the end to end tests for this branch and confirm that they are passing

[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
682	2	680	3

View the top 2 failed tests by shortest run time

tests/platform_helper/providers/test_config.py::test_validate_data_migration_fails_if_both_import_and_import_sources_present

Stack Traces | 0.03s run time

.../platform_helper/providers/test_config.py:166: in test_validate_data_migration_fails_if_both_import_and_import_sources_present
    assert mock_io.abort_with_error.assert_called_with(
.../hostedtoolcache/Python/3.12.8.../x64/lib/python3.12/unittest/mock.py:949: in assert_called_with
    raise AssertionError(_error_message()) from cause
E   AssertionError: expected call not found.
E   Expected: abort_with_error("Error: in 'test-s3-bucket.environments.dev.data_migration': only the 'import_sources' property is required - 'import' is deprecated.")
E     Actual: abort_with_error('Config validation has failed', ConfigValidatorError("Error in 'test-s3-bucket.environments.dev.data_migration': only the 'import_sources' property is required - 'import' is deprecated."))

tests/platform_helper/providers/test_config.py::test_validate_data_migration_fails_if_neither_import_nor_import_sources_present

Stack Traces | 0.031s run time

.../platform_helper/providers/test_config.py:118: in test_validate_data_migration_fails_if_neither_import_nor_import_sources_present
    assert mock_io.abort_with_error.assert_called_with(
.../hostedtoolcache/Python/3.12.8.../x64/lib/python3.12/unittest/mock.py:940: in assert_called_with
    raise AssertionError(error_message)
E   AssertionError: expected call not found.
E   Expected: abort_with_error("Error: 'import_sources' property in 'test-s3-bucket.environments.dev.data_migration' is missing.")
E     Actual: not called.

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