Fix sync for raw files whose display name has no extension

[TalLevAmi]

In dynamic folder mode, a raw file such as notes.txt gets a display name with no extension (notes), and a public ID with the extension (abc123.txt). _display_path used the display name as is for raw assets. The result:

• sync --push did not match the local notes.txt with the remote asset, so it uploaded the file again on each run. Each upload made a new asset.
• sync --pull saved the file as notes, with no extension.

I saw both problems on a live test cloud. After this change, a second --push skips the file and --pull saves notes.txt.

Brief Summary of Changes

• _display_path (cloudinary_cli/utils/api_utils.py): for raw assets, add the extension of the public ID when the display name does not already end with it (case-insensitive). The fetch behavior does not change.
• Unit tests for _display_path cover image, raw with and without an extension in the display name, and raw with no extension.

What does this PR address?

• GitHub issue (Add reference - #XX)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No

Reviewer, please note:

• A display name that already has the extension (for example an asset uploaded with -o display_name notes.txt) does not change.
• Fixed folder mode does not use _display_path for matching, so it does not change.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all the tests pass.

Local test run: I ran the full suite on Python 3.8 with Click 8.1.8. The new tests pass, and they fail without the fix. 8 tests in test_cli_agent.py and test_cli_config_oauth.py fail with stderr not separately captured on this branch and on master too. These tests need Click 8.2, which needs Python 3.10 or later. CI must confirm the full result.

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