Improve handling of SpriteAtlas after setting up a SpriteFrame in Sprite

[knoxHuang]

Re: #

https://forum.cocos.org/t/topic/163455/388

Changelog

1. Remove _applyAtlas from the engine code and handle it in the Editor Sprite inspector panel instead.
   2.Dependent atlas asset are only set if the user sets a SpriteFrame

Since the SpriteFrame's atlasUuid is null when using auto-atlas, the meta importer is the auto-atlas asset by up-querying for a suffix of .pac

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Continuous Integration

This pull request:

• needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

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Compatibility Check

This pull request:

• changes public API, and have ensured backward compatibility with deprecated features.
• affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• affects file structure of the build package or build configuration which requires user project upgrade.
• introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions]

👍 Package size ⤵ -18 bytes, old: 5280433, new: 5280415

Interface Check Report

This pull request does not change any public interfaces !

[github-actions]

@knoxHuang, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.6
• Task Result: FAIL
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/d12857f7-3dde-4b50-8904-f7306d2b6dc5/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/12704959969

Task Details

Platform	build	boot	runned	crashScene	FailScene
web-mobile	PASS	PASS	FAIL
ios	PASS	PASS	FAIL
mac	PASS	PASS	PASS

[github-actions]

@knoxHuang, Please check the result of run test cases:

• Test Platform: PR-Test
• Editor Version: v3.8.6
• Task Result: FAIL
• Task URL: https://cctest.cocos.org/#/reportview/PR-TEST/60a653e7-36f2-4be2-affe-55b1b4f5cd56/-1
• GitHub Action: https://github.com/cocos/cocos-engine/actions/runs/12704959969

Task Details

Platform	build	boot	runned	crashScene	FailScene
windows	PASS	PASS	PASS
android	PASS	PASS	PASS
wechatgame	PASS	PASS	FAIL	dynamic-mesh	dynamic-mesh