fix(android): java deployFromZip() and deployFromAssets()

[jquick-axway]

JIRA:
https://jira.appcelerator.org/browse/TIMOB-28246

Summary:

• Fixes regression caused by PR fix(android): Ti.Media.previewImage() fails to display in-memory blobs as of 9.1.0 #12271 .
• Caused Java TiFileHelper.deployFromAssets() and TiFileHelper.deployFromZip() to fail.
• Note that nobody uses these Java methods. It is dead code. (But could be used in the future.)
• Added new TiFileHelper.emptyDirectory() which behaves the same as Node's fs.emptyDir().

Test:
I've already tested the Java code by hand via the Android Studio debugger. I think we should skip QE and merge it once code reviewed.

[build]

	Warnings
⚠️	This PR has milestone set to 9.3.0, but the version defined in package.json is 10.0.0 Please either: - Update the milestone on the PR - Update the version in package.json - Hold the PR to be merged later after a release and version bump on this branch

	Messages
📖	💾 Here's the generated SDK zipfile.
📖	✊ The commits in this PR match our conventions! Feel free to Rebase and Merge this PR when ready.
📖	✅ All tests are passing Nice one! All 12060 tests are passing. (There are 900 skipped tests not included in that total)

Generated by 🚫 dangerJS against 09db253

[garymathews]

CR: PASS