[Widget Export] - Added pattern support for widget title in export filenames

[rusikv]

Before: export filenames only included the entity name.
After: the widget's default name is also included in the export filename, making it more informative.

See details below with example.

If used pattern in tittle:

File name on widget export:

Before:

After:
(Additionally added widget default name to file name)

General checklist

• You have reviewed the guidelines document.
• Labels that classify your pull request have been added.
• The milestone is specified and corresponds to fix version.
• Description references specific issue.
• Description contains human-readable scope of changes.
• Description contains brief notes about what needs to be added to the documentation.
• No merge conflicts, commented blocks of code, code formatting issues.
• Changes are backward compatible or upgrade script is provided.
• Similar PR is opened for PE version to simplify merge. Crosslinks between PRs added. Required for internal contributors only.

Front-End feature checklist

• Screenshots with affected component(s) are added. The best option is to provide 2 screens: before and after changes;
• If you change the widget or other API, ensure it is backward-compatible or upgrade script is present.
• Ensure new API is documented here

Back-End feature checklist

• Added corresponding unit and/or integration test(s). Provide written explanation in the PR description if you have failed to add tests.
• If new dependency was added: the dependency tree is checked for conflicts.
• If new service was added: the service is marked with corresponding @TbCoreComponent, @TbRuleEngineComponent, @TbTransportComponent, etc.
• If new REST API was added: the RestClient.java was updated, issue for Python REST client is created.
• If new yml property was added: make sure a description is added (above or near the property).