Add deprecation note for Maps SDK V3 BETA samples#1

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antonsurya wants to merge 2 commits intomainfrom

deprecate-v3-beta-samples-10862731660830152383

Commits on Dec 4, 2024

fix: Re-add MarkerDemoActivity that was accidentally removed in https://github.com/googlemaps-samples/android-samples/commit/429748845447201869a02cf8888881a6142a0d6a
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Commits on Feb 4, 2026

docs: add deprecation note for Maps SDK V3 BETA samples

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