feat(skeleton): replace the background animation with opacity

[Artem4991]

Заменить анимацию skeleton с background на opacity, чем значительно улучшить ее производительность (особенно на мобильных телефонах)

Чек лист

• Задача сформулирована и описана в JIRA
• В названии ветки есть айдишник задачи в JIRA (fix/DS-1234), ссылку прикреплять не надо
• У реквеста осмысленное название feat(...) или fix(...) по conventional commits (https://www.conventionalcommits.org)
• Код покрыт тестами и протестирован в различных браузерах
• Добавленные пропсы добавлены в демки и описаны в документации
• К реквесту добавлен changeset

Если есть визуальные изменения

• Прикреплено изображение было/стало

[changeset-bot]

🦋 Changeset detected

Latest commit: 7042452

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 43 packages

Name	Type
@alfalab/core-components	Patch
@alfalab/core-components-skeleton	Patch
@alfalab/core-components-calendar-with-skeleton	Patch
@alfalab/core-components-segmented-control	Patch
@alfalab/core-components-select	Patch
@alfalab/core-components-switch	Patch
@alfalab/core-components-tabs	Patch
@alfalab/core-components-typography	Patch
@alfalab/core-components-custom-picker-button	Patch
@alfalab/core-components-input-autocomplete	Patch
@alfalab/core-components-international-phone-input	Patch
@alfalab/core-components-intl-phone-input	Patch
@alfalab/core-components-picker-button	Patch
@alfalab/core-components-select-with-tags	Patch
@alfalab/core-components-table	Patch
@alfalab/core-components-accordion	Patch
@alfalab/core-components-calendar	Patch
@alfalab/core-components-chart	Patch
@alfalab/core-components-circular-progress-bar	Patch
@alfalab/core-components-comment	Patch
@alfalab/core-components-confirmation	Patch
@alfalab/core-components-file-upload-item	Patch
@alfalab/core-components-gallery	Patch
@alfalab/core-components-list-header	Patch
@alfalab/core-components-list	Patch
@alfalab/core-components-markdown	Patch
@alfalab/core-components-navigation-bar-private	Patch
@alfalab/core-components-navigation-bar	Patch
@alfalab/core-components-product-cover	Patch
@alfalab/core-components-pure-cell	Patch
@alfalab/core-components-stepped-progress-bar	Patch
@alfalab/core-components-tab-bar	Patch
@alfalab/core-components-calendar-input	Patch
@alfalab/core-components-calendar-range	Patch
@alfalab/core-components-date-range-input	Patch
@alfalab/core-components-date-time-input	Patch
@alfalab/core-components-universal-date-input	Patch
@alfalab/core-components-bottom-sheet	Patch
@alfalab/core-components-modal	Patch
@alfalab/core-components-popup-sheet	Patch
@alfalab/core-components-side-panel	Patch
@alfalab/core-components-universal-modal	Patch
@alfalab/core-components-tooltip	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[coveralls]

Pull Request Test Coverage Report for Build 24021305723

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 81.903%

---

Totals
Change from base Build 23963415204:	0.0%
Covered Lines:	9578
Relevant Lines:	11599

---

💛 - Coveralls

[github-actions]

Demo build (default)

https://core-ds.github.io/core-components/2121

[github-actions]

Demo build (alfasans)

https://core-ds.github.io/core-components/2121-alfasans

[fulcanellee]

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