[Security] Huawei, Jcenter, Jitpack repos clean up to reduce supply-chain attack surface

[Manuiq]

In this PR:

• Applying com.huawei.agconnect plugin in huawei flavor only. Also limiting Huawei repo to fetch only Huawei related libraries.
  Huawei plugin is not open-source, hosted on a private repo (https://developer.huawei.com/repo) and developed by a Chinese company with a known history of cyberspy allegations (https://en.wikipedia.org/wiki/Criticism_of_Huawei).
  This is an ideal recipe for a supply-chain attack where in one of routine CI builds a modified agconnect plugin can be automatically downloaded, inject code into the build which will be distributed with the apk release.
  Please consider dependency hashing to reduce the risk further (https://www.droidcon.com/2023/07/31/android-security-securing-your-gradle-builds-from-baddies/)

• Dropped Jcenter repo for buildScript and project itself . The only dependency hosted there (https://github.com/google/flexbox-layout/releases) has been moved to mavenCentral. Version increase brought only package name change according to their github page. Jcenter was also compromised in 2018 supply chain attack (https://web.archive.org/web/20181214053140/http://blog.autsoft.hu/a-confusing-dependency/)

• Dropped Jitpack repo for buildScript . Project repo scope reduced to the only library hosted there (https://github.com/AbedElazizShe/LightCompressor).

• This should also benefit build times a little due to reduce index of repos and one less build plugins for gplay flavor.