ADFA-779: Fix oversized ADfA logo in Navigation Drawer sample

[davidschachterADFA]

Summary

• The Navigation Drawer sample's drawer header referenced a single density-independent drawable/ic_launcher_round.webp, so Android upscaled it past its native resolution on high-density screens — the ADfA logo appeared roughly twice as big as it should and looked soft.
• mipmap-xxxhdpi/ic_launcher.webp and ic_launcher_round.webp had also been left on the old stock Android launcher icon while every other density had already been rebranded, breaking the density-scale progression (the ticket's "both mipmap-xxxhdpi icons are incorrect").
• Per the latest comment on the ticket, replaces the ADfA logo with the current Code On The Go app icon design (blue phone + green globe), as a self-contained vector drawable for the nav header (crisp at any density) and regenerates every mipmap density's launcher icons consistently at the correct scale.
• The phone glyph is scaled to 80% within the vector's circular badge so it sits fully inside the white circle instead of overflowing it (caught via on-device visual check).

Test plan

• Rebuilt assets/core.cgt (the zip-based sample-template archive) with only the Navigation Drawer template's icon resources replaced — verified zip integrity, exact set of changed/added/removed entries, and XML well-formedness of the new vector drawables
• :templates-impl:testV8DebugUnitTest passes
• Built and installed a debug APK on a physical arm64 device, created a fresh Navigation Drawer project, ran it, and confirmed the nav drawer header now shows the Code On The Go logo correctly sized and centered inside the white circle badge

Fixes ADFA-779.

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[davidschachterADFA]

Closing this PR: assets/core.cgt shouldn't be hand-committed as a binary in this repo. It's meant to be reconstructed from the exploded templates/ source tree in appdevforall/dev-assets, by that repo's deploy.yml workflow, and this repo's build then downloads the rebuilt artifact from the CDN.

Reverted the original commit in 728359e so this branch goes back to the CDN-downloaded core.cgt. The actual fix (nav-header logo replacement, stale mipmap-xxxhdpi assets, adaptive icon foreground/background) is being redone at the source in a PR against appdevforall/dev-assets.