fix(PDiskSpaceDistribution): use only space severity for slots

[artemmufazalov]

Closes #2060

New logic:

1. Slots are part of PDisk, they could be occupied by VDisks or not (empty slots)
2. Slots and VDisks are different entities, slot is occupied by VDisk
3. Slot is named by group ID and pool name, we don't know actual VDisk inside slot before hovering
4. Slot and VDisk could have different statuses

CI Results

Test Status: ✅ PASSED

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
286	286	0	0	0

😟 No changes in tests. 😕

Bundle Size: ✅

Current: 83.25 MB | Main: 83.25 MB
Diff: +0.09 KB (0.00%)

✅ Bundle size unchanged.

ℹ️ CI Information

• Test recordings for failed tests are available in the full report.
• Bundle size is measured for the entire 'dist' directory.
• 📊 indicates links to detailed reports.
• 🔺 indicates increase, 🔽 decrease, and ✅ no change in bundle size.

[Copilot]

Pull Request Overview

This PR fixes the severity calculation for VDisk slots in PDiskSpaceDistribution by using only the allocated space percent for severity, ignoring other VDisk statuses.

• Updated the severity logic in src/store/reducers/pdisk/utils.ts to remove combination with other status values.
• Adjusted tests in tests/preparePDiskDataResponse.test.ts to verify the new behavior and added an extra test to ensure VDisk statuses are ignored.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/store/reducers/pdisk/utils.ts	Updated severity calculation logic and comments to use only space severity for VDisks.
src/store/reducers/pdisk/tests/preparePDiskDataResponse.test.ts	Updated and added tests to align with the new severity calculation for VDisk slots.

[Copilot]

Pull Request Overview

This PR fixes the severity computation for vDisk slots in PDiskSpaceDistribution by using only the space allocation percentage.

• Removed the combined severity calculation in favor of using getSpaceSeverity exclusively for vDisk slots.
• Updated tests to verify that vDisk severity is determined solely by allocated space.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/store/reducers/pdisk/utils.ts	Updated vDisk severity calculation to rely solely on allocated space.
src/store/reducers/pdisk/tests/preparePDiskDataResponse.test.ts	Adjusted tests to reflect the new severity logic for vDisk slots.