Remove one-shot alternate text parity snapshot test

[sosek108]

Explanation of Change

This is a stacked cleanup PR on top of #99062 (fix/search-adopt-lhn-alternate-text), which itself stacks on #99061.

#99061 introduced a one-shot snapshot parity test (tests/unit/ReportAlternateTextParityTest.ts + tests/unit/__snapshots__/ReportAlternateTextParityTest.ts.snap, 145 cases) whose only purpose was to prove the extraction of LHN alternate-text logic into ReportAlternateTextUtils was zero-diff.

#99062 introduced the permanent drift gate tests/unit/LhnSearchPreviewParityTest.ts, which asserts LHN === Search preview equality on live code and fully replaces the snapshot test's role. The one-shot snapshot test is now dead weight: every intentional preview change would force snapshot churn going forward.

This PR deletes the snapshot test and its snapshot file (single commit: a7695e1cbbe Remove one-shot alternate text parity snapshot test).

Note for reviewers: until #99062 merges to main, the diff against main also shows #99062's changes. Please review only the Remove one-shot alternate text parity snapshot test commit. Once #99062 merges, this branch will merge main and additionally remove the cspell.json ignore entry for the snapshot file (that line arrives on main via commit 7c5cdab9172, part of #99061).

Fixed Issues

$ #98958
PROPOSAL:

Tests

This is a deletion-only change with no user-facing behavior.

1. Confirm tests/unit/ReportAlternateTextParityTest.ts and tests/unit/__snapshots__/ReportAlternateTextParityTest.ts.snap no longer exist on this branch.
2. Run npx jest tests/unit/LhnSearchPreviewParityTest.ts and verify it still passes, confirming LHN/Search preview parity is still covered by the permanent drift gate.

• Verify that no errors appear in the JS console

Offline tests

N/A

QA Steps

Same as tests

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

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