Missing PR templates after CPP SDK migration to Hiero

[gsstoykov]

Before moving the CPP SDK to Hiero resulted in missing PR templates. Before the migration we had the following template:

Description:
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Related issue(s):

Fixes issue_link1, issue_link2...

Notes for reviewer:
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Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)