Sanitizer: Set useLegacyPackaging for asan

[robotchaoX]

[Why]
Property useLegacyPackaging determin whether to use the legacy convention of compressing all .so files in the APK. If null, .so files will be uncompressed and page-aligned when minSdk >= 23. Otherwise, it failed with "INSTALL_FAILED_INVALID_APK: Failed to extract native libraries, res=-2" when minSdk >= 23.
And wrap.sh is only available for API level 27 and above.

[How]
Set useLegacyPackaging to true.
Set compileSdk to 27.

[Reference]
https://developer.android.com/ndk/guides/asan

[fmayer]

@DanAlbert @enh-google PTAL

[enh-google]

(this one i think i do understand, and it does match what i believe to be true. but you might still want to wait for danalbert next week if you want more than a "seems legit?" from someone who doesn't really know what they're talking about :-) )

[DanAlbert]

I added explanatory comments but otherwise LGTM.

[DanAlbert]

... but our CI's broken. I'll go look into that.

[DanAlbert]

GitHub is currently in the middle of rolling out changes to the GHA images that alter how the Android tools are installed: actions/runner-images#8952. That bug says that sdkmanager is supposed to still be there, but maybe that isn't happening. I see Sentry updated their CI to use https://github.com/android-actions/setup-android, which I think tells us the problem:

Adding platform-tools (contains adb) and cmdline-tools/11.0/bin (contains sdkmanager) to $PATH.

I guess sdkmanager moved to a non-predictable location? Awesome. I'll send a PR to switch us over to setup-android.

[DanAlbert]

#975 appears to fix it. Once that merges I'll rebase this PR so the checks can re-run, then it should be good to merge.