Wait for soroban upgrades to prevent races with loadgen

[marta-lokhova]

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[Copilot]

Pull request overview

This PR improves reliability of the mixed pre-generated Soroban-limit upgrade flow by explicitly waiting for the full set of configured Soroban limits to become visible on a peer before proceeding, reducing the chance of races with subsequent load generation.

Changes:

• Add a consolidated poll/wait that verifies all relevant MIXED_PREGEN_* Soroban limits (ledger + tx) are applied before continuing.
• Refactor limit computation into a single record (MixedPregenSorobanLimits) to reduce duplication and ensure consistent values are used for both upgrade creation and waiting.
• Adjust slp_eval.sh evaluation defaults by lowering NETWORK_SIZE_LIMIT.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/FSLibrary/MinBlockTimeTest.fs	Adds a single polling loop that waits until all upgraded Soroban limits match expected values, preventing races with loadgen.
scripts/slp_eval.sh	Changes the evaluation wrapper’s default network size limit (277 → 100).

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