fix(requests): update request results stuck 'fetching' (#542)

[citruspress]

Request states are now updated using rxjs finalize() when still status: 'fetching'. This fixes an issue where observables were cached after immediately cancelling them.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngneat/elf/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #542

What is the new behavior?

If request results still have the status 'fetching' when finalizing, the status is set back to 'idle' and loading, success and error are all set to false.

Does this PR introduce a breaking change?

[ ] Yes
[x] No (Not that I'm aware of)

Other information

If we misunderstood something when using elf, we'd be happy to change things on our end.

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