fix(cli): scope Android debug applicationIdSuffix (fix #15561)

[cyphercodes]

Fixes #15561.

Summary

• Limit Android applicationIdSuffix edits to the buildTypes.debug block.
• Avoid inserting the suffix into unrelated debug blocks such as signingConfigs.debug.
• Add regression coverage for both the scoped update and the no-buildTypes case.

Test plan

• cargo test -p tauri-cli mobile::android::tests --lib
• git diff --check

[github-actions]

Package Changes Through 14f1398

There are 1 changes which include tauri-cli with patch

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/cli	2.11.3	2.11.4
tauri-cli	2.11.3	2.11.4

Add another change file through the GitHub UI by following this link.

---

Read about change files or the docs at github.com/jbolda/covector