Remove rewards health check and log if period has passed already

[thomaspanf]

This PR removes the rewards health check and handles a revert message that occurs when a trusted node tries to submit after the period has already passed:

rocketpool_watchtower  | 2026/03/12 07:21:34 [Merkle Tree] Generation complete! Saving files...
rocketpool_watchtower  | 2026/03/12 07:21:37 [Merkle Tree] Error submitting rewards snapshot: Could not estimate the gas required to submit the rewards tree: Error getting transaction gas info: could not estimate gas limit: error estimating gas needed: execution reverted: Invalid RPL rewards

• removed the rewards submission health check
• added logging: Rewards period %s has already reached consensus (current index is %s), skipping submission
• added bool submitted to the submitRewardsSnapshot signature, that way Run() and generateTreeImpl() can log the results correctly

[github-actions]

Coverage Report

[github-actions]

Merging this branch will decrease overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/rocket-pool/smartnode/rocketpool/watchtower	0.52% (-0.00%)	👎

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/rocket-pool/smartnode/rocketpool/watchtower/constants.go	0.00% (ø)	0	0	0
github.com/rocket-pool/smartnode/rocketpool/watchtower/submit-rewards-tree-stateless.go	0.00% (ø)	2143 (+55)	0	2143 (+55)

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.