feat(useFetch): introduce updateDataOnError option

[climba03003]

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⚠️ Slowing down new functions

Warning: Slowing down new functions

As the VueUse audience continues to grow, we have been inundated with an overwhelming number of feature requests and pull requests. As a result, maintaining the project has become increasingly challenging and has stretched our capacity to its limits. As such, in the near future, we may need to slow down our acceptance of new features and prioritize the stability and quality of existing functions. Please note that new features for VueUse may not be accepted at this time. If you have any new ideas, we suggest that you first incorporate them into your own codebase, iterate on them to suit your needs, and assess their generalizability. If you strongly believe that your ideas are beneficial to the community, you may submit a pull request along with your use cases, and we would be happy to review and discuss them. Thank you for your understanding.

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Description

Revert the behavior introduced in #2711, since it is a breaking change. I don't mind the default changed to false in next release, but it shouldn't be v10.
Introduce new configuration allowFetchErrorReturnData to configure the behavior of onFetchError. If anyone don't like the data being replaced by this hook, just set it to false or return data as null.

Additional context

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🤖 Generated by Copilot at a3bf42f

This pull request adds a new feature to the useFetch function, which enables the onFetchError hook to return data in case of a fetch error. It updates the UseFetchOptions interface, the useFetch and createFetch functions, and the corresponding tests and documentation in packages/core/useFetch.

🤖 Generated by Copilot at a3bf42f

• Add a new feature to allow onFetchError hook to return data for useFetch function (link, link, link, link)
• Update the documentation of useFetch to illustrate the new feature with a console.log statement (link)
• Update the tests of useFetch and createFetch to check the new feature with expect statements and ctx.data assignments (link, link, link, link, link, link, link, link, link, link, link, link, link)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[antfu]

Made a few updates:

• Renamed to updateDataOnError
• Flip the default to false to avoid breaking changes
• Update the doc descriptions