[SREP-3734] Fix retryer exponential backoff using XOR instead of exponentiation

[smarthall]

Summary

• In Go, ^ is the bitwise XOR operator, not exponentiation. The expression 2^attempts produced incorrect sleep durations (2s, 3s, 0s, 1s) instead of the intended exponential backoff (1s, 2s, 4s, 8s).
• Replaced 2^attempts with 1<<attempts (bit shift) to produce correct powers of 2.

Test plan

• Verify the retryer sleep durations follow exponential backoff: 1s, 2s, 4s, 8s, etc.
• Confirm OCM retry behavior works correctly in integration tests

🤖 Generated with Claude Code

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This pull-request has been approved by: smarthall
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[ritmun]

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