Image组件alt接口支持加载失败时显示 · Pull Request !71897 · OpenHarmony/arkui_ace_engine

1. Image组件alt接口支持加载失败时显示
---
**IssueNo**:
**Description**: (提交描述)
**Sig**: SIG_ApplicationFramework
**Binary Source**: No(涉及则Yes)

## 请勿修改以下选项内容，仅需保存后点击复选框，或在编辑时将对应项前面的[ ]改为[x]
## Do not modify the following option content. Simply save and click the checkbox, or when editing, change [ ] to [x] for the relevant item.
### Feature or Bugfix
- [ ] 需求/Feature
- [ ] 缺陷/Bugfix
### 是否涉及非兼容变更/Whether it involves incompatible changes
- [ ] 是/Yes
- [ ] 否/No
### TDD自验结果/TDD Self-Verification Results
- [ ] 通过，请在下方提供截图/Pass. Provide execution details in picture below.
- [ ] 失败，请在下方提供基线执行情况截图/Fail. Provide baseline execution details in picture below.
- [ ] 不涉及/Not Involved
### XTS自验结果/XTS Self-Verification Results
- [ ] 通过，请在下方提供截图/Pass. Provide execution details in picture below.
- [ ] 失败，请在下方提供基线执行情况截图/Fail. Provide baseline execution details in picture below.
- [ ] 不涉及/Not Involved
### 检视意见是否都已闭环/Have all review comments been resolved
- [ ] 是/Yes
- [ ] 否/No
### 是否已执行L0用例
- [ ] 已验证/Yes
- [ ] 不涉及，请在下方说明原因/Not Involved. Please specify the reasons below.

类型	指派人员	状态
审查	@arkui_image 由 .gitee/CODEOWNERS 文件第 2480 行指派为审查者	进行中 (0/1人)
审查	李俊峰 LiuYongchang caocan ZhangYu xuyue jiangdayuan Caoruihong piggyguy_jdx shiyu_huang jinweiliu jyj_0306 yeyinglong 徐承桦 zhanghaibo yanshuifeng yangfan229 zhouchaobo Sunfei 何溯 lushi1202 lixingchi1 王一卉周沺耳 firminly	进行中 (0/1人)
测试	openharmony_ci	进行中 (0/1人)

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