feat: pass platform from env variable or fall back to use old logic

[zdtsw]

Description

• introduce new env var ODH_PLATFORM_TYPE set during buildtime
• rename old function GetPlatform() to DetectPlatform()
• create new GetPlatform to check env first or fall to call DetectPlatform()
  (split from [RFC] feat: pass platform from env variable and fall back to use old logic #1231)

How Has This Been Tested?

Screenshot or short clip

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• The developer has manually tested the changes and verified that the changes work

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[ykaliuta]

I support the change. And it is backward compatible. Just worried about the formal process now.

[zdtsw]

i can markt it to [draft] for now and wait to see how / when we want it