Temporarily disable write_file::run_block test

[imunproductive]

It appears there is currently a bug which makes WriteFile's run_block test to fail on CI. I am still unsure if it was introduced by some PR or something else. I've checked all the versions (Ubuntu, GitHub runner's image, Rust toolchain, etc) and all of them seems to be the same, so it's unclear what changed that made the test fail.
Until I figure out and fix the issue, the test should be disabled so it doesn't interfere with other PRs.

[artob]

@race-of-sloths invite

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Current status: waiting for finalization

The pull request is merged, you have 24 hours to finalize your scoring. The scoring ends Fri Jan 23 22:39:06 2026

Reviewer	Score
@artob	5

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[github-actions]

⚠️ CI failed

Platform	Name	Status	Details
All	Formatting	✅	Details
Linux	Build library	❌	Details
Linux	Build binaries	❌	Details
Linux	Build tests	❌	Details
Linux	Build examples	❌	Details
Linux	Run tests	⏩	Details
Linux	Run doctests	⏩	Details

[artob]

@race-of-sloths score 5