feat(fe): abort outdated requests

[fterra-encora]

Description

This was specially aimed at aborting outdated requests for the data-fetcher component, used for auto-completes.
But this can also be used on higher scopes, since it required updating the useFetch composable.
This is useful because when a client application aborts the request, it doesn't need to spend time/bandwidth to download the corresponding response later.
And hopefully in the future, aborting a request can also be signaled to the server and the server can abort the corresponding processing.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Documentation update

How Has This Been Tested?

• New unit tests
• New integrated tests
• New component tests
• New end-to-end tests
• New user flow tests
• No new tests are required
• Manual tests (description below)
• Updated existing tests

Checklist

• I have read the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have already been accepted and merged

Further comments

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[github-actions]

Current changelog

Features

• abort outdated requests (0e17554)
• remove unused variable (bd2bb5c)
• use the aborted status instead of timestamps (626e27b)

[github-actions]

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