Refactored storage.py put methods

[rads-1996]

Description

Added typing to the put method of LocalFileBlob and LocalFileStorage. Updated LocalFileBlob.put to return a success status when the file path is successfully constructed, instead of returning self, as this value was not being utilized anywhere.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull Request Overview

This PR refactors the put methods in the storage.py module by adding proper typing annotations and updating the return behavior. The LocalFileBlob.put method now returns StorageExportResult.LOCAL_FILE_BLOB_SUCCESS instead of self to improve clarity since the self-reference was not being used anywhere in the codebase.

Key changes:

• Added type annotations to LocalFileBlob.put and LocalFileStorage.put methods
• Updated LocalFileBlob.put to return StorageExportResult.LOCAL_FILE_BLOB_SUCCESS instead of self
• Updated corresponding test files to reflect the new return behavior

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
azure/monitor/opentelemetry/exporter/_storage.py	Added typing imports and return type annotations, updated LocalFileBlob.put to return StorageExportResult.LOCAL_FILE_BLOB_SUCCESS
azure/monitor/opentelemetry/exporter/export/_base.py	Updated comment to reflect new LocalFileBlob.put return behavior
tests/test_storage.py	Updated all test assertions to expect StorageExportResult instead of LocalFileBlob instances
tests/test_base_exporter.py	Added new tests to verify proper handling of the new StorageExportResult return values

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