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]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
684	1	683	3

View the top 1 failed tests by shortest run time

tests/platform_helper/providers/test_config.py::test_validation_fails_if_invalid_pipeline_version_override_keys_present[terraform-platform-modules]

Stack Traces | 0.136s run time

.../platform_helper/providers/test_config.py:299: in test_validation_fails_if_invalid_pipeline_version_override_keys_present
    config_provider.load_and_validate_platform_config()
dbt_platform_helper/providers/config.py:47: in load_and_validate_platform_config
    self.config = self.file_provider.load(path)
dbt_platform_helper/providers/yaml_file.py:47: in load
    YamlFileProvider.lint_yaml_for_duplicate_keys(path)
dbt_platform_helper/providers/yaml_file.py:59: in lint_yaml_for_duplicate_keys
    with open(path, "r") as yaml_file:
E   FileNotFoundError: [Errno 2] No such file or directory: 'platform-config.yml'

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